There shouldn't be, but you might depending on how fast/how antsy the clock operator is.

And no, there is no mandatory run-off. I know you didn't ask, just trying to promote awareness. I had an R this year take off .3 after a quick touch and deflection OOB when the clock had not started. This was right after I (C tableside) told the coach who wanted time to come off that unless we have definite knowledge (like a count or looking at the clock when it should have stopped) then we cannot add/take off time. Yeah, that was a fun game.