The pain lessens into an uncomfortable ache, a sense of pressure that, the more the procedure goes on starts to concentrate in his mind. Literally. He supposes, if this is his power, then the more he uses it the more he can hone it. Setting aside use, there's a leap here, to remember. At first, he felt pain in general. Sheer agonizing pain. Pain that couldn't be isolated or concentrated in one area.

Here, now, the building, distracting pressure, it's in his brain and precisely the part of the brain Hope's procedure is taking place.

If only one good thing could come from this torture, then in theory the next time someone happens to Hope, he'll know. Just where she's shot. Or stabbed. He shuts his eyes because the last thing he needs to think about is Hope being injured.

This is all an experiment to this man, and to Cassius. A sadistic one, but with an outcome they both want. There's no reason not to cooperate now, and kill after. So he lets out a shaky breath he doesn't need to be taking and concentrates on his daughter's heart beat, trying to calm his own in the process. There will be a reckoning, but not while his instruments are inside Hope's head.