Numair might have wanted to drive Hawk away in order to try to protect him. Numair's in a whole lot of trouble, apparently from multiple directions; Hawk might get killed and/or captured just because of an association with Numair.
Of course, he's already been captured, nearly killed, and made a batch of enemies all on his own. I suspect that, while neither of them is safe in any case, they're both a little safer together. Plus which -- that needs to be Hawk's informed decision; not one made for Hawk by Numair, for whatever motives.
Re Sraddi -- yes, that's what it looked like to me; Hawk's not sure whether anybody's in there, but doesn't want to be rude if someone is. -- do we know whether somebody's in there? I can't remember all the interactions we've seen with Sraddi.