I found that if you already have the glider ability (since it’s account wide), when Braham runs off down the cliff at the start, if you take a shortcut and glide down to the camp then the next part of the quest will trigger, skipping the dialogue and Braham will stop halfway down the cliff and just stand there.
You can still talk to the npcs and make the choice whether to go to the cave or protect the camp and after that Braham will go back to normal, but you miss the story about what’s going on and skip straight to the decision.
I guess I shouldn’t take shortcuts. :P