[Remus was a Prefect, it was once his responsibility to help very lost and overwhelmed Hogwarts students. He can't just leave this be.

He blocks the crowd off from bumping into the boy. In fact, people seem far more reluctant to bump into Remus at all, for some reason.]

Excuse me, are you alright? Here, let's get out of the way of the foot traffic, yeah?

[He guides him over to the side of the street with a gentle hand on his arm.]

I'm Remus, by the way. I hope I'm not imposing, you just seemed a little lost.