"It's biological. He's a walking virus, basically." There's no hesitation, Frank knows more about Kilgrave than maybe any other villain he'd faced. And if he comes here, with his powers in tact? He needs to know he can protect everyone. That's the kind of thinking that fucked him over in Reims, but maybe he can't turn that part of himself off as much as he'd really like to. He's circling back to what Ravi said. The end of brains, what a turn of phrase. "Is it... like having someone else in your head?" Guess who knows what that's like.