I can never imagine I'd have enough mental energy to even try and diagnose an engine that suddenly gave up on me. Flying the aircraft under unusual conditions, even if they were amply trained and retrained for, AND finding a suitable field AND landing there with minimal damage will be more than enough to keep me occupied. Let alone reassuring a possible passenger.
If ever it happens to me, I intend to not even try to restart, unless everything else looks perfectly bright. Or perhaps if a fellow pilot were in the other seat.