Greg DeWolf, a long time Windsports Flight school instructor, is demonstrating the launch tecnique when the wind direction is not straight into the slope. In this case the wind is from the SW which is to the left of Greg.
It was a very sad day for us long time hang glider pilots and for perhaps thousands of former students when we got word that Greg had died on December 4th (2017). He was reported to have dropped as he was working at his computer. He had a long and distinctive history in hang gliding. He will be greatly missed by many. :-(