But it has no use. There are better things to do afer a HKD. If they block it you are -2 without pushback and Cryo isn't good at that distance. If they delay wakeup the recovery is really long. If you break the armor it's just 13 damage leading to nothing and the knock down is too short to try it again. NJK is safe against armored moves in the corner (the only place where Air Hammer is effective for armor breaking) and JIP into 111 breaks some armors too in addition to changing sides of the controller while returning you to the correct position on hit.
If it didn't knock down (as I said, the first hit is a true restand, but the second one knocks down so it invalidates it), that armor break would lead to a 50/50 so there would be a reward, and there are ways to finish corner combos on air hammer, sacrificing damage and requiring good execution but this way you could sacrifice damage to keep your momentum. Finally it would mean that opponents have to respect you midscreen because you can cancel your assault earlier to drop the air hammer, but you have to be really careful because the hammer is slow and even bare fist uppercuts win against it, not to mention air to air hits. Basically it would be a tool that won't be so powerful as counters are easy to find and execute but would force opponents to at least respect Cryo.
Currently Cryo can't force mistakes on opponents and he DEPENDS on punishing opponents mistakes (he is NOT a rushdown character like many believe because of the cool weapons, he gets eaten alive when trying to play like that), that's why I think he needs a tool like that to spice things up.
