Depends on how you look at it ...
Yes, he is angry ... yes, he is snarky ...
But on the other hand his life (and lifes of everyone around) are threatened while you keep key to his (and their) salvation before his nose, just barely out of his reach ...
I dont think that his ... attitude ... at that moment should be defining his aligment. :-/
I mean ... even the goodest paladin in the world CAN get angry, for the right reason.
I also dont believe Gale is purely good tho, after all he seems like that kind of type who would sacrifice everything and everyone for Mystra ... and that is certainly quite selfish thing to do.
