I would guess all the blood and gore smeared all over the inside could have been from chicks frantically bouncing all over the place trying to avoid the predator attack, and I am with the majority on that conclusion.
This was an awful tragedy, and it makes me sick just thinking about it. These wonderful creatures are so fragile, I wonder sometimes how they survive. Chicks especially, such tiny little beings, are so helpless and dependent.
I had such a near tragedy. When my current batch of four chicks were just two weeks old, I had placed them in their safe space play pen out in the main run on a warm summer afternoon. When I checked on them later, one chick was running around completely scalped - as in the entire back of her head gone, as if surgically removed. All the skin and flesh down to the thin membrane covering the skull - gone. On a tiny chick, an area the size of a dime would correspond to an area on our heads the size of a beanie.
No blood, but the remaining skin was unanchored and slipped around. It was hideous. I didn't expect her to live, but I wrapped her in a soft cloth and placed her on a heating pad in a small pet crate that night with some food and water. Next morning, expecting to find her dead, instead, she was hopping around, happily eating!
So I've spent the subsequent six weeks caring for her wound, each day cleaning and medicating it, and new flesh has slowly grown in from around the edges until she only has a tiny hole (like a blow-hole on a whale) that I can barely fit a Q-tip into. I attribute her growth hormones and my persistence in her recovery. I used Blu-kote and Silvadene, by the way. Blu-kote to keep infection and curious chickens at bay and the Silvadene to keep the tissue moist so it will encourage growth. Silvadene, if you aren't familiar with it, is commonly used to help regenerate tissue after being burned.
If Gash's wound is substantial, you will need to watch out for infection. It can kill after you are busy being thankful your chick survived the attack. Try to keep the wound cleaned on a regular basis so that bacteria doesn't end up getting trapped under re-grown tissue.
Try not to blame yourself. Like I said, these critters are fragile. This stuff just happens, even when we try our best to think of everything.
