Before anyone starts flipping out, this gimmick was known from day one, many times since release multiple players have tried to get something out of it and it's not worth sacrificing the damage for something that isn't even positive advantage, so it's not like he got a nutpunch or anything. It was never worth the meter as it sacrifices a huge ton of damage to let you at negative advantage.
If air hammer always worked like this (but with positive advantage) it would be useful, but that move is one of the most useless in the game and got even worse when every armore move started getting double armor. Most Cryo players wouldn't even notice the difference if it was removed from the game.