The pilot is a very lucky boy with a bit of skill thrown in.
Nevertheless, I am sure his boss is asking just what he was doing that manoeuvre for. I really can't see any need for it.
A good rule of thumb is that you need 100 ft to accelerate 10 Kts in auto. Therefore, to accelrate to 50 Kts you need approx 500 ft. I must say that the conduct of Yaw Control Emergencies (YCEs) are probably the hardest to practice. I am not sure of the amount of right pedal he had and there are a couple of techniques available to him. The fact that he was in a hover made it more difficult, but reducing Tq either by lowering the collective or retarding the throttle would reduce or stop the yaw.