This is a great video from ASP.
We talk Tueller’s work and that of others relative to distance and reaction time.
Keep in mind that in this situation the cop had more than ample time to prepare mentally for what is about to happen, he’s already got his weapon drawn and keeps it at low or high ready throughout the encounter.
Put yourself in the same situation as the defender who typically is going to keep their weapon holstered until the attack is launched.
Would you be able to stop the threat?
When Training alone I have a simple drill. I hold a rock or ball in my left hand, come to a low ready with my weapon. I then extend my left hand level to the ground dropping what’s in it and try to put my first shot on target before it strikes the ground.
You can always use a partner to drop the ball/rock etc give you the go and see if you can get that first shot on target in time.
The whole video is well worth watching but you can advance to the 2:50 point for the charge.
Note, this charge started at around 24-26’ and the subject wasn’t particularly quick or athletic, just a very distraught, probably UI 18yo girl.
Notice too that the first couple of shots had very little effect on her which is why my main carry weapons are all .40 S&W or .45acp.
Shots 1&2 had little effect on her at all, the 3rd had a substantial deterrent effect and she goes down hard with the 4th.