That there is something to address....sounds like a neighbor war for sure....best of luck to you.I think he could have been thrown over the fence (they've done that before with birds they've killed). Two days ago, they had one of MY roos locked in their coop/pen. He's the baby of a cornish x so he couldn't have flown over there.
He was stiff, completely stiff, but under his feathers he was still somewhere between 65-75°, not stark cold. He was definitely warmer than the 50° it was outside.
Another odd happening was those kids were looking around my yard where he was, last night, while harassing my other roo with a remote control helicopter.
I just find it very odd that a hawk could swoop in and none of the other 11 roosters made a sound (and the hawk completely disregarded the birds he could catch and eat).