So he knows how to sell basically. If he said straight up to take whatever they wanted it wouldn't have worked as well. He made them ride a roller-coaster of emotions just to arrive to that point. He made them feel something different that they normally wouldn't be able to.
That is why they did...
So a man starving to death, struck by an avalanche and a grash corpse, managed to eat till full in a mere couple of seconds and digested it fast enough to fight?