Disagree Rotorboater....
It is ONLY pilot handling inexperience/inability through lack of exposure.
Pressing the left pedal (see my long boring analysis of the accident) did result in droop and at 24secs the pilot 'dumped the lever' for 1 second (unnecessarily) in response - all part of being out of control.
No height need be lost - if you use the lever to keep the height and the cyclic to keep level and press pedal as required to stop yaw - you will not have a problem.
It does not matter if the droop causes the horn to come on - since the engine is able to deliver more power the governor will add it (even if the pilot does not help it by adding throttle as required) the temporary RRPM droop does not threaten flight (and need not alter the height at all).
Ideally pilots should be able to distinguish the difference and preserve RRPM when the engine cannot deliver sufficient power to maintain RRPM - if the engine is working and the droop is temporary due to rapid pedal application then lowering the lever does not really help - it just makes you go down... remember lowering the lever closes the butterfly also...
You do not need to lose height when you lose 'grip' of the yaw...
It is more appropriate to stop yaw by using the pedals than keeping them still and lowering the lever!
It is only pilot mis-handling...