Good CRM on the pilots part. Since he was a check airman giving IOE to the new captain he was very comfortable in the left seat and having someone in the right seat made the situation more normal since he also checked out FO's. If nothing else he could read the check lists and help with the radio work. I can understand the passengers being alarmed but how else could you find a pilot passenger? Bet he feels great knowing he helped land an airliner with 150 hours.