It's the wastelands, you shot at some dude you felt threatened by. No worries that's how things work in a post apocalyptic country with the second ammendment. If he didn't want to get shot he'd have kept his damned distance in the first place and even THAT is more courtesy than most people would afford someone, many people would just shoot him outright. He was probably banking on the whole "Crafters aren't PK minded they wouldn' shoot a blue suit I bet. Well good job, you had awareness and noticed suspect actions and acted on it.
No need to explain yourself. Carry on, I guess.