Knoterror
Noob
The only way I can see this not being viable is if a player can wakeup faster than the AI will in Practice mode. Standing 2~H20 Boost used near the middle of a combo has enough slowed gravity that cancelled into H20 gives you advantage. If H20 allowed it, you'd have enough time to block anything, except maybe Reptiles dash. Used in the corner, your opponent cannot jump or wakeup with anything and if they just block, they can eat an H20 Boosted throw or continued pressure.
Viable tech?