It is mainly evident in the sequence with the sand people. He does not act concerned or even a little fearful when investigating the situation. Is his charachter really suppose to be that brave? But what really gets me is when the Tusken is attacking Luke the gaffi stick, he has absolutely no fear on his face whatsoever. Also when he tells 3PO,"We gotta get out of here before the sandpeople return." There is not one degree of urgency in his voice.