WHEN an auto pistol malfunctions, a tap-rack-bang will usually get it back in action, even if you don't know the cause.
While this is often true, if you don't know (or have some idea) of the cause, a tap-rack-bang could be a tap-rack-KABOOM!
I understand the need for "training as real as it gets", and how one does need to be proficient getting the gun back in action rapidly. However, I think its a mistake to train a beginning shooter to do this, as an automatic, unthinking response. Save the emphasis on combat drills until they are a little further along.
When you are training, target shooting, plinking, or even hunting, when the gun malfunctions (for any reason) it should be "game over" until the reason is determined. Failure drills should be done, but these should be planned events by the instructor, for safety. Keeping them unknown to the shooter helps train them for the unexpected, but the instructor should have set them up. Misfires, hangfires, and squibs are rare but they can, and do happen, and have even happened with factory ammo.
Consider that, while clearing a dud, getting a fresh round in the chamber and firing might be needful when someone is shooting at you, that "dud" might have been a squib, and if the bullet is far enough in the barrel to allow chambering another round, firing that round could be a disaster. Acceptable risk in a firefight? sure. Acceptable risk on the firing line? Not worth the risk, I think.
When working with complete "newbies" don't try to teach them to run before they can walk. Neither of you will be pleased with the results.