On the other Hand, the chances of a TR failure are much smaller (like a thousandfold) than an engine failure. So no reason NOT to Backup. The guys in Leicester were simply extremely unlucky. The Dynamic rearward Part depends on the helicopter type. Same for the „fly-away“ Profile. On a H145 it is all very easy and slow as the bird has plenty of power. In a 109 you have to nose it over aggressively to fly away without too much altitude loss.