Looks like VRS to me. Difficult to see from any of the angles whether there was any rate of descent, but the initial right yaw would fit with a sudden application of collective to try to arrest a descent. This could have been the trigger to enter VRS, which leads to the apparent loss of yaw, and subsequently pitch & roll control as the VRS becomes fully developed.
I agree incipient VRS is not difficult to effect a recovery from, but if you consider the likely "startle" effect, and a few seconds to recognise and react, then fully blown VRS is not easy to recover from, particularly from this height.
Last edited by Non-PC Plod; 9th Sep 2016 at 09:28.