But you're not human. [ Steve points out, and maybe that's the problem here. ]

You know how savage this looks? [ Steve is no saint, he's killed people too, but not like this. ] Some of the hostages aren't in their right mind right now. If they see we did this, we look just as bad as the people who kidnapped them.

[ He's less angry when he hears the extremist was trying to take over Justice's mind - obviously he reacted out of instinct, but it worries Steve that his instinct was to behead that person. ]

Kill someone like that again and I'm confiscating that sword. [ And now Steve is cleaning up Justice's mess - dragging the body to somewhere more hidden. ] You can get the head.