I've only had experience with one of my snakes getting injured by live feeding (both my BPs are on f/t now though)

I had to feed my adult male medium live rats when I first got him because he refused f/t for me.. I would sit there to stop the rats from hurting him, but the rats did bite him one time and he got a nasty cut from it.. no blood though, i treated it with neosporin and the scar has healed with each of his sheds.. but you can still see a little bit of a scar.