Coons usually work together, one coon will be on one side of the pen and scare the birds to the other side where another coon is waiting to grab it when it gets to close to the side.They say you learn something every day. My local hardware guy ( he's my predator expert) told me mink or weasels were the ones that just ate the blood.
If your wire is large enough for a coon to get its fingers through, they can kill poultry. I don't understand why the birds wouldn't stay away from the sides, but they don't seem to. I'm not as nice as Citychicken, when I screwed up and put young birds in a pen that wasn't coon proof, I was really mad, both at the coon and at myself. But I fixed the problem, which was the pen, not the coon. A lot of people seem to have good luck using electric fence around their coops & runs, but I free range during the day and my geese are always free. I'm afraid I would kill one of them.