Skip to the 1:15 minute mark to get to the carnage.
This is why you don’t want to hit trees while speed flying.
Do not add ‘hitting tree’ to this definition:
Speed Flying (also known as speed riding) is the air sport of flying a fast, small fabric wing, down a steep slope. Speed flying and speed riding are very similar sports; speed flying is when the speed wing is foot-launched, while speed riding (or ski gliding) is a winter sport done on skis. Sustained flight with a speed glider is possible over a ridge in strong winds. – wikipedia
Apparently, the guy was okay.