Yep, it's very cool, but the commentators raise a very good point. Bowlers bowl a certain way depending on whether the batsman is left-handed or right-handed.

Of course the point could be raised that:

a) It's a pre-meditated shot. Ie it is being performed before the ball is even released, making it extremely risky and perhaps giving the bowler enough time to adjust his line. Of course not every bowler could do this.

b) The specific ball of Ravi Ashwin to a left-handed David Warner would have been very wide. Again, it's possible he adjusted his line or it's possible (likely) that he was distracted by Dave's switch.

Another scenario must be raised and will come up if this is to continue (as I'm sure it will). Consider Ashwin not changing his line (assuming he did) and he continued to bowl outside off-stump to a left hander. In Dave Warner's scenario, it would be too wide to hit, but seeing as he is a naturally left-handed batsman, I don't see how the umpires could call a wide. Perhaps the bowler didn't have enough time to adjust his line, and then again, why should they have to if a batsman is going to be so capricious? I certainly hope they wouldn't call it a wide.

If Dave had missed that ball, it would have continued past what would have been his natural leg-stump. By a long way. But you shouldn't call that a wide either, as Dave switched his grip and stood the other way. Perhaps the bowler did adjust his line. This leaves us with a problem. When this move happens, it essentially gives a bowler two off-stumps (for the purposes of wide-balls).