Melee Broke Halfway Through A Mission

[-Bluhman-]

Partway through a mission using a Bo with Clashing Forest, I somehow managed to make it so that I was unable to perform any melee attacks while standing on the ground:

 

Aerial attacks and ground slams still worked. I mention I don't know precisely what caused it but I think it might have been due to me attempting a finisher on a prone enemy that somehow moved out of position or died before the animation could properly trigger.