Okay, I grant that this is an interesting skill and idea.....but kinda hard to practice, isn't it? I mean, you have to get together with a bunch of dive buddies and hope that conditions are okay, or you have to make use of a pool.......
Ya can't just be practicing this stuff walking down the street, I'm sure....and the bathtub is a bit restrictive....
If only I had the chance...
I guess almost everything I know would be out of place in the water, I mean how many other martial arts give the advice - 'Try to get behind your opponent by going underneath or over him and not around'? That's crazy in any other context. It would have to open your mind about what is and isn't possible.
Maybe in the future when we all live in space all martial arts will look like this?