He was jumping a Xaos-21 68, at a 2.0 wing loading. Manufactured Nov 01. Winds were out of the SW 10-16mph. I was watching his whole canopy flight, he had finished his right hand carving turn and was flying straight and level into the south about 100ft up. The right side of his canopy collapsed and sent him into severe line twist, his canopy looked like a streamer. It was so quick there was nothing he could have done.