Mi-2 helicopter crash some feet away from spectators

What happens in this video ?

This Mi-2 helicopter was performing a demonstration for an airshow. The pilot made a rapid descent and did not manage to reduce the descent rate before impacting the ground.

Comments

Rusty
Toronto

(Canada)
Total pilot error, he flew into his own wake turbulance ( yes helicopters can do that) Also known as vortex ring state if he had of done what he was trained to do he could have got out of that
16th March, 2011
mac
London

(Uk)
lord have mercy, lucky none of them spectators got a piece of them blades in there head!
19th April, 2010