There's at least one other Tribute up on the roof. One of the more unusual Tributes, in fact. But she seems friendly enough, or at least willing enough to share the roof.

On the other hand, it's probably not every day that one finds what looks pretty much like a dragon anywhere, much less a roof. True, it probably shouldn't be surprising that a dragon might have reason to want to get closer to the sky then most people would, but it doesn't change the fact of what she is. She doesn't speak up either. Instead, she simply watches Sam, mostly because if nothing else she's pretty sure she hasn't seen him before (and because she's curious to see what might end up happening next).