For anyone interested in this incident, there is quite a bit of
discussion on paraglidingforum.com:

http://paraglidingforum.com/viewtopic.php?t=1405

The consensus seems to be that the pilot applied and held brakes when
entering a thermal and this caused the wing to stall and deflate which
resulted in a cravat (tip stuck in the lines). The wing was spinning so
the pilot tossed the reserve chute. The pilot landed in a tall tree
with the wing draped over the tree and, while hanging there and picking
twigs out of the lines, he then fell to the ground basically unhurt.
His lucky day I suppose!

Steve