I don't recall any "specifics" on death by coyotes, but here's a conversation with a resident around my camp in up-country NH 2 years ago.
The lady I had the conversation with raised Bison @ the time and she asked if I wanted to buy the remaining 4 Bison before the coyotes got to them.
At one point she had 27 total and as little as 1 year, they killed the other 23, to leave her with 4.
She said they would pack up and surround the 200 lb. Bison and nip at the achilles heal until bring them down and finishing them off.
A long and painful death from a predator