[Tarrlok bows politely, because he knows how to play the gentleman, and this young woman obviously has manners. His own nametag reads:]

Hi, my name is Tarrlok! I'm in house #72! Are you my housemate?

[Or at least it does, until it switches to:]

Secretly, I am a conniving weasel-snake, a bloodbender, and my father is a criminal.

You have nothing to apologize for. This is clearly the work of someone with an odd sense of humour who's trying to facilitate discussion between total strangers.