[just another ref]

Originally Posted by Nevadaref

Then why not simply say, "No shot" or "Before the shot"?

"On the floor" describes a location, not an action.
It doesn't tell anyone whether the player had begun shooting yet or not. Thus, it is a very poor phrase to use for such situations.

This is actually the one I use the great majority of the time.

It must. Every time I use it someone yells, "But, he was shooting."