I have stopped deer in the past and have not had a real problem. But if the deer is jumping out of it's skin and looking at me, I wouldn't shoot.

If you do it quiet enough, the deer usually stops and looks around to identify the sound. I wait till I get the tail flicker (or the first step forward) and then shoot.Granted it doesn't work all the time and I don't always do it. Shooting at an even paced slow moving deer thatare in close is not all that much of a problem.