It's happened at that intersection before.
Walking home from the train, I stopped at an intersection to wait for my light. A gentleman I had passed on the way didn't stop, but there was no traffic to speak of. I suppose I could have crossed, too? I was in no hurry and was content to wait the 30 seconds or so it would take for the lights to change.
I looked North to estimate how much time it would take then looked back towards the West. The man was gone. None of the shops were open across the street. I did not hear a car door open and close. There are no residential doors there. He was just gone.
It's happened before, same intersection, roughly the same time of day. I don't know if it was the same man or not. I really should pay more attention to things like that, at least at that intersection.