Sam had been walking the streets-- it was a long story that he didn't want to get into, but it involved some conflict-- when he noticed a man in a long coat heading his way and chewing. Possibly on gum, but that didn't concern Sam. What did, however, was the presence this guy seemed to be giving off.
It'd been a while since Sam's powers had acted up-- he thought he was through with them-- but sometimes his sixth sense came into play regardless of it's origins. Sam could tell he was dangerous, but the question was whether he was on his side or the other side.