"Because I had to! I couldn't take anyone else. Because I'm not you." It comes out in a jumbled guilty rush and he sucks in breath before he says anything more. His eyes are on Jim's face and his despair and just... that look in his eyes that Felix will do anything to try and stop. Has done.

"Because I can't save everyone," he says more quietly. "And I won't let you destroy yourself trying to."

Because he does know. He does understand, well enough to see how it would end.