I mentioned a while ago that the first time I feel we got a real visual* glimpse of Guts’ hound-esque inner darkness chronologically was during the rescue mission.
The way he cuts out the torturer’s tongue is very reminiscent of his tendency to torture apostles before killing them imo (which probably has its origins in the way he killed Donovan), and then he just rampages through the castle like a demonic one-man army, very black swordsman ish.
Look at this imagery like:
(i love Casca’s ‘holy shit dude’ expression)
Plus you got Charlotte saying he scares her, and the Wyald fight is when everyone starts comparing Guts to a monster and saying he’s inhuman.
So I was thinking - why? Why would we get this before the Eclipse, before he starts killing ghosts and infusing his sword with Essence of Darkness, before the brand + killing monsters make him literally superhuman? Why do we get our first look at monster slaying, revenge-obsessed, black swordsman Guts a day and only a day before the main event, the point of which is to make him revenge-obsessed, even takes place?
And I want to suggest that it’s because this is it - this is Guts’ revenge spree. It’s not one revenge spree that ends, followed immediately by another unrelated revenge spree. It’s the same rage. He killed the torturer like he kills apostles, then he fought an actual apostle to defend Griffith, then the Eclipse happened and he declared war.
It’s all intimately connected in Guts’ mind and emotions:
He started off on a vengeful rampage for Griffith in part as a way of externalizing his own feelings of guilt, and he continued on a vengeful rampage against Femto/NeoGriffith, also in part as a way of externalizing his own feelings of guilt.
We know this because as he’s running towards Griffith in the torture chamber Guts thinks about how it’s his fault that Griffith is there without actually coming to a proper conclusion (if that’s the case… then I -) - and he reaches that conclusion (was I the one who brought all this upon you?) right as he’s running towards Griffith at the site of the Eclipse. Guts’ guilt is strongly associated with his rage this way. Guilt followed by external target followed by lashing out.
Idk, there’s just such a through line to me from Casca telling him it’s his fault to the Eclipse. The most significant moments of Guts’ internal thoughts are given to him processing this information and finally concluding that he fucked up right before the Eclipse begins. The Eclipse didn’t then erase his feelings of guilt, it just let him continue to repress those feelings and gave him acceptable targets to lash out at instead of dealing with his feelings.
Now this is a bold statement, but I think that in a way, rampage part 1, kill half the soldiers of Midland, and rampage part 2, kill demons, are both about Guts avenging Griffith - the latter only in part ofc, because the rest of the Hawks need to be avenged too now.
Because the thing is, I think he still sees Griffith as a victim. After finally acknowledging that Griffith did sacrifice everyone, he still looks back at him wistfully. He thinks of Griffith while flashing back to the lost Hawks after the Eclipse. He tells Rickert that NeoGriffith isn’t the Griffith he knows (incidentally something Rickert repeats to NeoGriffith later, which NGriff acknowledges). He flashes back to Griffith in the snow a lot. To Guts, Griffith isn’t his friend who turned out to be a dick, Griffith is his friend who basically committed fantasy murder/suicide after being tortured for a year because Guts broke him by leaving.
His feelings towards Femto/NeoGriff are complicated and fucked up as all hell, but while his feelings for Griffith feed into his complicated feelings for Femto/NeoGriff, his hatred for F/NG doesn’t retroactively affect his feelings towards human Griffith. They’ve remained pretty solidly longing, guilt, love, regret. He’s not thinking of Griffith kneeling in the snow and feeling rage at what he would go on to do a year later, he’s thinking of Griffith kneeling in the snow and trying to find a way to atone for it. Griffith is still explicitly part of the “campfire from those days still [burning in his] chest.”
Idk basically I just wanted to say that a part of Guts’ fuel for his revenge rampage was feeling responsible for Griffith’s pain and not being able to save Griffith from it, both the first time against Midland and the second time against the Godhand, and I chose a very long drawn-out way to do that.
* I specify visual glimpse bc i think there’s a solid argument that it’s there when he kills Donovan, based on the way he taunts him and tortures him briefly first, but we don’t have any of the ragey demonic imagery associated with Guts’ darkness there - he just looks like a kid. So I feel like it works as a point of origin for a lot of Guts’ dark vengeful urges (Donovan is the first monster he killed), but he wasn’t anywhere close to losing himself to darkness then.