This video has generated over 100 posts on other forums. The strapless riding is good, but there is controversy about whether the rider can tail ride a board - strapless. It has been a heated debate with people claiming it is simple to others (like a Cabrinha pro rider giving away equipment to the first person to do it), to others claiming camera trickery and Velcro.
Scene in question is at 3:48 in the video.
Here's the video and two forum urls -
http://bit.ly/bg5Zpz
http://www.wakeskating.com/forum/viewtopic.php?p=539839