I flew choppers for 10 years and did many similar "return to target maneouvers" thankfully without this result, I have to think he had channelized attention for a second or two (maybe looked at the van or pers on ground momentarily) which led to his miscalculation of turning room/remaining altitude. Thankfully - no one was hurt, lucky !
BTW - that is a nice Vette - would like to have that one !
Yeah well no one will crash a copter by purpose...They must of chosen a damn good pilot to do a run like this...That kind of run needs good experience...