Nick: We're the same, you and me. We're the same, don't you see? Foster: We're not the same. I'm an American. You're a sick asshole. Nick: What kind of vigilante are you? Foster: I am not a vigilante. I'm just trying to get home to my little girl's birthday. And if everybody will stay out of my way, then nobody will get hurt.
Foster makes it clear to Nick that, in his mind anyway, he and Nick are very different.