I have fed live food for over 20 years. I have never, not one single time ever had an injury inflicted on any of my snakes from food items. I understand everyone’s concern but unless your snake is special, like knowing has a deformity, I think you have zero to worry about. The worst I ever had was a rabbit scratch one of my retics with it’s back foot.
The next shed and the scratch was gone. Before anyone starts to wonder, I fed on average 100lbs of rabbits every other week. The only thing I ever fed that was always frozen was piglets and that was only because I got still borns and ones that the momma pig rolled over.
I always supervised rat feeding for new snakes and baby-juvenile, once they were eating rats small or larger they were on their own.
At the end of the day you do you, I’m just telling you what my experience has been. In my opionion there is no reason to terrorize prey items by crippling them before you feed. I’ve seen some Burms and Retics put a hit on prey that actually knocked them out before they even squeezed the life out off them.