Sorry for a 'double' post, but had a few points. It feels like we may not be combat, but definitely should have been expecting bad stuff. If this is a 'surprise round' Grimgor has combat reflexes, so should get an AOO even when flatfooted. Unless something stops that?
Attack - (1d20+8)[12], Dam - (2d6+4)[14] EDIT: My God ...
If we're doing Init, his bonus is +8 right now.