Bloody hell, no wand made that easier. But oh that was another knife and not aimed toward him. And usually he wouldn't have minded terribly, but people he knew cared, so fuck no. He blasted the knife to smithereens and knocked her out cold. No, she didn't get to die. Anything but, but not die.
Pulling the knife out of his shoulder, Barty cast a basic spell to stop the bleeding. Fuck it, that was enough for then. Gathering her, Barty took care of her similarly to how he took care of Remus, including taking her to a cell close to his. Oh Barty had plans. But first, an interrogation.
Forcing veritaserum down her throat before she was terribly awake, Barty woke her up - chained so that none of her body could move except minor movement of her neck and her mouth. She couldn't kill herself. But he was extra alert on her.
And it was Vera Lestrange. Barty had known that, but now she even looked like herself. No one got to where he was looking like anyone but themselves. "Wake up!" Barty shouted at her loudly. This wasn't a tricksy one of sounding nice. That wouldn't work.