Targatop - I would have thought my concern is obvious - a low-time co-pilot with minimal SAR experience in the LHS of a SAR helicopter.
Lack of exposure to a demanding environment, insufficient CRM training and a big cockpit gradient - add to that underuse of the helicopter's SAR programs and you have some holes in the swiss cheese beginning to line up.
The coup de grace is an experienced captain becoming fatigued and making errors of judgement (no height hold or briefed return to base height).
This is what happens when you try to do SAR on the cheap.