that is a really broken ability,and the way mother assasin die I think once the wave hits your body you are done,she is constantly moving the wave,probably in a resonance way so that it will not stop and will go around your body and constantly increasing like how her other arm being positioned in the other side got destroyed too. And resonance can teorically ignore defense,everything has a natural frecuency if you found it and constantly apply it to a body the force increases and never stops till it snaps and its natural frecuency changes.However, i believe each wave she sends can only have a predermined frecuency or her dirt waves should have ended the fight in the first instance mother assasin ride the wave.
Also smash next