Let's just reiterate it here... don't do this kind of trick in a tail wind because your canopy could malfunction. It's called a line-over - that means one of the lines of the parachute are misrouted over the top of the canopy, causing it to spin.
Scary situation, but the guy that hit water is okay.
You went to driver's ed to do something safe like drive a car... Don't skip base jumping school, this will save your life! If you don't have the time to do the necessary 200 skydives before learning to base jump then consider getting a taste of Base Jumping with a Tandem Base jump. See Tandembase.com for details. For Base jump instruction visit Seanchuma.com