Jackson has absolutely no idea what he's done to deserve this, but he knows that he's forgotten something -- he asked Jono to take it all away, all the things that had been twisted and changed at the root of his psychological problems -- and it must have been important. He doesn't recognize the voice, doesn't understand the significance of being called Jack, and doesn't even question any of it. He can't. When he opens his mouth in an attempt to speak, all he cough is sputter blood.

With a final, violent twist, Gray shoves the knife in to the hilt and pushes Jackson forward to heap onto the ground. He looks unsatisfied, as if finally seeing his years of planning to completion isn't actually good enough, and takes a measured step back. He doesn't look sure of himself now, doesn't seem to know what he's doing now that he's killed his brother.