Draco's Motivations in the Book 7 Room of Requirement Confrontation
I just reread the Fiendfyre sequence and based on a close reading Draco's motivations and actions are a lot more complex and sympathetic than I remembered. Not to mention, once again, here there be drarry.
First, the context:
After the incident at Malfoy Manor, we know from Harry's psychic connection to Voldemort and from the Carrows' overheard discussion that Voldemort's wrath was exceptionally terrible. The Malfoy family became virtual prisoners in their own homes for months and were subjected to especially brutal (even by Voldemort's standards) torture that was also likely quite protracted. Lucius has visible marks on him months later - which, given what we know about magic in that world, really speaks to the level of what has been going on. While he probably got the worst of it, it's certain that none of his family members escaped unscathed. After their other failings they have at this point probably permanently fallen out of favor and have nothing but a (likely short) life of misery to look forward to.
Draco bears a lot of responsibility for this state of affairs since it was he who chose not to identify Harry. This likely adds to his sense of conflict as his conscience tells him one thing and everything he has ever been taught tells him something else. He presumably feels responsible for the suffering his family (we know from book 6 that he does genuinely care about them) has to endure.
Not to mention that he himself is suffering along with them. It would be unsurprising therefore if he felt tempted to "rectify" his earlier moment of what he probably perceived as weakness and made a last ditch attempt to save his parents' (and his own) lives and prestige. While Harry has been taught that love and mercy are noble and valuable impulses, Draco has not. In his world love and mercy are called weakness.
Quite possibly as he suffered and faced death alongside his family, part of him must have felt ashamed of the impulses that led to his choices when Harry was a prisoner at the Manor. Everything he has been taught tells him that Voldemort's victory is inevitable and that his moment of shameful weakness has accomplished nothing except to fail his own family and condemn them (and himself) to a likely short life filled with suffering.
At most what we see in the Room of Requirement is a replay of what we saw on the Astronomy Tower - where Draco is deeply conflicted and when confronted with the reality of violence in support of Voldemort cannot go through with it even under tremendous pressure and even though his failure to carry out these acts of violence will inflict danger and suffering on himself and his loved ones.
But, is that even what actually happens? In my opinion, the answer is "no."
The scene in question:
If we actually look at the text it's not even clear that's what's going on at all. Draco's motives are ambiguous at best here. The scene starts when Harry is stretching out his hand to take the diadem. Draco, Crabbe, and Goyle come up behind him and he is completely unaware of them. Draco then announces their presence, alerting Harry that he is being watched. He could've very easy simply stunned Harry or attempted to put the Imperius Curse on him (or killed him) while his back was turned. But he didn't do any of those things. Instead he talks, thereby ruining the element of surprise.
And that's not typical of Draco at all when he actually wants to attack Harry. He's never beaten Harry in a face-to-face confrontation. (In fact, the last time he tried - in 6th year - he almost ended up dead.) The two times he has managed to incapacitate Harry - when he petrified him on the train in 6th year and when he hid and caught Harry for Umbridge with a tripping jinx in 5th year - he did so by using the element of surprise to his advantage.
Given that Draco knows that Harry is a very formidable opponent (AND that Harry's friends are nearby) if he truly simply wanted to capture or kill him, announcing his presence is the last thing he would ever do. Then he says "That's my wand you're holding." He still doesn't cast any spells - not even to try to disarm Harry. He also doesn't say he wants to hand him over to Voldemort. He doesn't even tell Harry to drop his own wand, attempt to take him prisoner, or even threaten him.
It is Crabbe, not Draco who says "We're gonna be rewarded...We decided to bring you to 'im." Draco doesn't say anything about his own intentions other than that he wants his wand back - and we certainly know that even in 6th year he didn't trust Crabbe and Goyle, much less now, and thus is unlikely to speak openly in front of them.
At this point Ron comes to investigate and Crabbe tries to use magic to cause a mountain of debris to fall on Ron and crush him. Harry counters the spell and Draco then grabs Crabbe's arm when he tries to repeat the spell. He gives as his justification the need to avoid the diadem being crushed but since we know he doesn't trust Crabbe it's likely this isn't truthful. Especially since Voldemort has not said anything about wanting the diadem (and even if it wasn't a Horcrux it likely wouldn't be damaged in any case).
Crabbe points out this very thing and Draco argues with him at which point Crabbe says "Who cares what you think? I don't take your orders no more, Draco. You an' your dad are finished." So arguably he was not even including Draco in the "We" he imagined would be rewarded. Crabbe then tries to use Crucio on Harry.
Draco then again intervenes and tries to stop him.
"STOP" Malfoy shouted at Crabbe, his voice echoing through the enormous room. "The Dark Lord wants him alive--"
He doesn't even just say it. He shouts. We rarely see Draco shout. He is someone who generally keeps his deeper emotions hidden - it's why he's so naturally gifted at Occlumency to the point that he is powerful enough at a young age to lie to both Snape and Voldemort.
What he says here doesn't really even make sense because Goyle isn't even trying to kill Harry; he's just trying to hurt him. However Draco is so distressed by this that he actually starts yelling, something we NEVER see him do at ANY other point in the book. "The Dark Lord wants him alive" is also exactly what Snape says to Bellatrix as they flee in book 6, and we know that Snape's real intent was to protect Harry with a believable excuse. It's the only thing Draco could reasonably say in that moment as a justification.
Crabbe (rather sensibly) points out that 1) he didn't even try to kill Harry and 2) Voldemort ultimately wants Harry dead so it probably doesn't matter that much. This makes perfect sense. And yet Draco is inordinately concerned with preventing harm to Harry & Co rather than with taking any action to capture or even disarm any of them.
Clearly he did not expect to lose control of Crabbe and Goyle like this and as a result is now losing control of the situation (and himself). (Unlike Harry, Draco is more of a planner and is not as good at reacting in the moment.) Also the possibility that Harry could be killed seems to drive him nearly to the point of hysteria - rather like how Ron reacted to Hermione being in mortal peril at the Manor. This is not just a general aversion to killing. This is something more. He finds the idea of Harry dying truly unbearable. (I don't need my ships to be canon; this one just happens to be.)
At this point they start fighting and Draco loses Narcissa's wand. Wandless, he STILL tries to intervene. Crabbe and Goyle are both aiming their wands at Harry and Draco once again starts yelling - "Don't kill him! DON'T KILL HIM!" and is obviously in significant distress and is not at all happy with what is going on.
After that the Fiendfyre gets loose and the rest of the scene goes down without much dialogue.
At NO POINT does Draco 1) actually say he wants to hand Harry to Voldemort OR 2) attempt to attack Harry or Ron or Hermione at all OR 3) use his Dark Mark to call Voldemort OR 4) tell anyone he's seen Harry after they get out of the Room of Requirement - even in a later scene when he's been cornered by a Death Eater who is considering killing him he doesn't reveal this information even though that probably would've proven his loyalty or at the very least distracted the Death Eater.
Conclusions about Draco's motivations:
So, where does that leave us? What went down there and what was Draco trying to do?
We really have 3 options.
Option 1: Draco tried to hand Harry over to Voldemort in order to save himself and his family, got cold feet and couldn't really go through with it, and then lost control of the situation due to Crabbe and Goyle's changing loyalties.
Verdict: Possible but unlikely given the remarkably bad job he does of it and how inconsistent his approach is with his usual MO. Even if we assume his heart wasn't in it you'd think he'd at least have got as far as disarming Harry before announcing his presence. Especially since Harry almost killed him last time they fought (and Draco probably doesn't know Harry didn't know what the Sectum Sempra curse would do.)
And if his heart WAS in it then then this makes even less sense since he not only didn't attack Harry while his back was turned but also didn't call Voldemort or even inform anyone that he'd seen Harry.
Option 2: Draco wanted to get himself captured in a way that looked convincing so that he could take the chance Dumbledore offered in 6th year, only it went quite badly wrong.
Verdict: This would be an interesting possibility but I think it's also unlikely as it's simply too risky. He doesn't know Harry was there on the astronomy tower or that Harry would make the same offer. His family would also likely be murdered if Voldemort realized this had happened.
Option 3: Draco wanted to cut a deal in order to improve his family's situation without actually handing Harry over - perhaps he hoped for some kind of exchange where he could get his wand back and bring Voldemort the diadem as some kind of consolation prize - but overestimated his control over his cronies and lost control of the situation.
Verdict: I actually think this works best given his behavior during the scene. He initiates a conversation because he wants information about what and where the diadem is (and what value it would have to Voldemort) and because he wants to make some offer along the lines of 'give me my wand and the diadem and we'll let you go.' This could get him what he wants and help his family without actually harming anyone.
Also it hedges his bets a bit because if Harry wins he will owe Draco. The problem of course is that Crabbe and Goyle aren't happy to just take orders anymore and have their own goals. At that point, instead of caving and going along with what Crabbe and Goyle want to do instead, Draco actually tries to intervene, albeit in a way that doesn't actually expose him as questioning Voldemort.
Draco made his choice at the Manor. If he wanted to hand Harry over he would have. But he couldn't. He cares about him too much. But he also feels tremendous guilt and fear over the price he and his family are still paying for that decision. This is his attempt to try to fix things - to try to find a middle ground between the conflicting imperatives that are tearing him apart. The reality though, as he shortly discovers, is that there is no middle ground. And when he sees that, once again he chooses Harry.
