"That's quite the welcome....Batgirl," Black Mask says, getting over his initial panic at the sound of his men being summarily discharged outside of the nursery. When the girl pukes, he knows - he knows! - he has the upper hand. There's some sort of twisted affection in his bulging unblinking eyes, coupled with a fiery sort of triumph.
Black Mask puts the baby back into a crib, more intrigued by the panting Batgirl before him. He could have used her real name in front of everyone, but he chose not to. He made that choice to make it clear to Stephanie Brown that he definitely had that power to use, should he want to. He might not be Roman Sionis any longer, but there is something about the intense, infallible persona of Black Mask that, even now as Jeremiah Arkham, he can still remember what he did to this young woman.
And it thrills him almost as much as it angers Jeremiah. To torture the girl for no scientific purpose other than pain? That went against all of Dr Arkham's logic. Roman Sionis was a sadist, but Jeremiah Arkham was an objectivist. And as Black Mask, he paired power with his scientific thoughts.
"I do need a nurse to help me with my experiments," Black Mask muses aloud, as he surveys Stephanie. He is, indeed, considering taking Steph along. "Come with me, and I promise I won't revisit the past on you. We'll forge a new future together, Batgirl. Once Killer Croc arrives with our way out, then either you die or you come with me. I promise I won't hurt you...again. Your choice."
Steph doesn't get an opportunity to talk because that is the very moment Croc barrels over towards the nursery, making all the babies start to wail even louder.
"There's two of 'em!" Croc suddenly bellows, making his entrance known to everyone in the ward. "Purple here ain't the only Batspawn around. They're playin' us for fools!! There's another one skulkin' 'round here somewhere--" He looks around as best as he can, his sense of smell and his whiplike tail compensating for his poor eyesight.
"WHAT?" hisses Black Mask. He rushes to look outside the window, just a glance, where he sees the bright array of GCPD authorities arranged outside. "Then enough wasting time. We'll take what we can and go. Croc - did you get what I asked for."
Croc nods and dumps the bag down, tearing the sack open with his claws. "S.T.A.R. Labs practically threw 'im at me," Croc says proudly. "I guess he wasn't worth much to begin with."
What lays within the sack can only be described as a monstrosity of human flesh and bionics. The meld looks more Frankensteinian than anything else, a mish-mash of skin and metal fused together to create some sort of mega-being. Once it's out of the bag, it struggles to stand to its full 8ft height, clearly disoriented and terrified.