[mrnoodle]

That dead deer has been dead for at least a day, I'd guess. notice all the hair sloughing off in the road.

The live one is looking kinda fluffy himself, and doesn't have the patches of hair worn off, indicating a late fall timeframe - pre-rut, but just starting to feel feisty. Also, notice the dead underbrush, but the kind of tacky mud texture of the dirt. Like it was a dry season, but had rained in the last week or so. What was the weather like in Oregon this year?

Oregon's hunting season starts as early as August 10 for archery, with concurrent rifle hunting going on in certain areas. It runs off and on through December, so there's plenty of legal hunting time this could've happened in.

There's also the option that the deer broke its neck during the fight. Mule deer have something like a 10% serious injury/death rate in males solely from fighting.