Good fumble rules

[SowZ]

You could fumble while striking a dummy at an angle and have a similar result though. People injure themselves while practicing alone all the time.

But again, I prefer fumbles that could not result in damage from a dummy as that is what leads to the silly scenario of the roomful of dead warriors.

You could punch a dummy in such a way that hurts your wrist or knuckles or elbow. You couldn't really punch yourself in the face, because it couldn't push back.