Coming to this old thread because it's almost all I could find on the subject! I just ran into the same problem on my 4th play-through and almost did everything the same as my last one (killed the gith group in act one - started the fight by tossing a grenade at the dragon from up top...). He was not hostile in last play-through so imagine my surprise as I walk up the stairs on this one and see him freak out on me! I even have Laezel in my party... There seems to be so little on this "bug" (or a reason for him being hostile). Help!
