I could see this being the case, but it's got to be very narrow timing, and it probably only applies for the same type of action. A friend and I used to do a drill with his Glock 9mm. (After ensuring the gun was unloaded) one of us would point the pistol right at the other's head. The pointee would initiate action by grabbing the gun and the pointer would try to pull the trigger. It was impossible to pull the trigger…
There are plenty of ways to simulate the exercise with no risk. If you want to do stress exercises, you need to come up with a different way. This[1] is one of the standard ways. Notice that at no point does a real gun get pointed at a human being? That's by design.