I absolutely believe this happens. Looks just like a juicy worm to them. I had a call drake with a prolapse a few months ago and the end of it definitely looked as if it had been bitten and bitten hard. It took weeks to heal with daily drake molestations, cleaning it and applying prep H and poking it back in. The injured tip turned all purple and brown and was obviously not going to heal. I ended up enlisting some help from my Sis in law to hold him and we used one of those little clear elastics to band off the dead tissue. After a few days the bad part dried up and I was able to snip it off, clean it and get the remaining corkscrew to stay in.
It worked! He's better than ever now. He is evwn back to using whats left of it.

No telling if he will be able to fertilize or not, but he is one of my favorites so i am so glad he didn't get sick and die on me from infection.