... whoa dude, that could have been really bad, glad your ok!
I did the exact same thing in exact same depth of water years ago on my very first attempt at a back roll on a very angry Naish X2 18m kite. I'd barely knew how to kite or even hold ground, I didn't know I should have pulled the front hand sooner but in my confusion I pulled the back hand until I had my back to the water with angry kite looping and my brain thought, pull front hand now,,,, but way too late, smash. The last thing I saw was the kite tomahawking into the water right before I hit. I was lucky the kite pulled so hard that I bounced on the water instead of going in head first.
At the time I thought, why the hell would you do tricks, you got to be crazy. Speaking of dumb, I attempted the same thing, one week later going the other tack and I told my self, remember,,, pull left hand as you start rotating to re-direct kite. Guess what,,, this dumb arse (ass) didn't figure, your going the other way d!ckhead, so its the wrong hand again. Did the same thing didn't I.
Anyway, sometimes the brain just doesn't think too well hey!