It's pretty hard to tell by just that. He could be checking you out but then it could be a coincidence since you said he was standing at a weird angle. You should observe him more. If you see him again see if he does it again.
There is this guy in my class and one day after class he turned around to where I was standing, at a rather strange angle and just stared at me smirking a bit, he was like putting his jacket on and didnt take his eyes off me. Is he into me?
He's a Psycho. Beware