The meaning could be resumed with:"I know you think it's not fair but it's
not my problem" usually tied with a shrug.
and kill the one.
"Hei, I was chatting there..."
Often is used when someone does something hurting or annoying to another people, after giving him large pre-warning of where his actions would take him.
"I Say DON'T DO THAT boy"
"Ok, you've done it"...BANG! BANG!
"Scazza" (while looking at his flat laying body...