[He panics for a second before he puts a charming grin. If it was Billy-come-from-the-dead, well, he'd certainly would be quite... angrier, probably, and there'd be more manhandling.
So either he's got amnesia or he's got a twin or he's pretending not to know him. And either of those options work for him]
Taking in the sights, trying to see where a poor sailor could get something to eat, perhaps something to patch his thirst?