Helicopter BO105 violently crashed during an aerobatic maneuver

What happens in this video ?

This US registered Helicopter BO105 violently crashed during an aerobatic maneuver. The chopper exploded, and the pilot was killed.

Comment

Carl Hackert
Saratoga Springs, Ny

(Usa)
What was the pilot thinking? Thus makes no sense.
5th March, 2010