If knock down target, has not been reset, should there be a mandatory reshoot for the shooter? Especially, with a shotgun pop up, there is a time difference between shooting where they were, and actually engaging a knock down and its pop up target.
Exclude the fact that the TO should have noticed the targets not being reset for this discussion, if you would.
In fact, should a reshoot be mandatory for even a fallen target, "target/prop failure" rather that an optional reshoot? As always, SAFETY infractions would carry over.