I fought someone too. Not as hard as Booker, but these are bad people. But they're still people and seeing them die is disturbing, to say the least.
I have a lot of mixed feelings about this and I don't know how to talk to him about it. I should say something so he knows, but. . . I don't want to blame him for what his dream self did or even say what his dream self did was wrong. I just need some time and space, I think.