What was a fresh CPL pilot, training for a instructors rating doing flying over pretty rough terrain( or any for that matter), at night in bad weather conditions?
More to the point, why was he doing it at low level, whilst clearly uncertain of his position, and with no radio calls for navigation assistance? It looks to me like CFIT (as no mayday call for a failed engine which you would expect a new-ish CPL studying for an Instructor's rating to have got off).
Being lost at low level in adverse wx is bad enough, but to do it at night...
Yeah, I know, wait for the report...