that must have been horrible; I feel for you having to deal with that.Mine have been injured. 2 were dead. one had what appeared to be a broken neck. The cockerel had a horrified look on his face and was much gentler after that.
The other dead one had a big gash on her side under the wing and a different cockerel continued to mate her corpse.
After all this drama I tried a bachelor grow out. But the boy on the bottom didn't fair too well either.
I wonder what drives the differences in behaviour; individual personalities I guess, which in turn seems to be a combo of nature and nurture. Other explanations?