I guess if I had spoken to the guy the night before and had some kind of rapport with him, I may have reacted differently. But he just gave off very creepy vibes from the second I met him, and neither of us spoke a single word to each other. In fact, he didn't speak a single word to anyone, even as he was asked to leave. Also, he was between me and the door. If he hadn't been, I simply would have gotten up and left the room.
If he had simply gone into the next room and taken a 15 minute shower, everyone probably would have known what he was up to, but no-one would have been particularly bothered.