I see. I would think about a tiny amount of it being okay. Not very much at all, and once he surrenders, then you can immediately take back the desired object and withdraw. Then like, a couple minutes go by so nothing is confusing, and you counteract the fear you just used with some lovings, since you got what you wanted, and you want to reward the obedient behavior.
Basically employing just enough fear to halt his aggression, but then no more, and going back to using just positive reinforcement.
I’m no expert, incidentally. This is all just old anecdote from my youth, and now I’m getting away from that into more theory and shit, so I’m getting even further out from my wheelhouse. Kinda just waiting now for another Lemming to tell me what a dumbass I am, and explain more modern dog training methods. lol