I saw the fawn after the fact; I had heard that it was a GBU rider that hit it but didn't know who. Looks like like you were a couple of hours ahead of me; I had a near-deer experience before turning where 89/87 separate and decided to spend some time at the rest stop aka Ironbutt Hotel and wait for morning light.
Even in the morning light there was a section that I saw at least a dozen of them damn rats and a suicide one tried to impale me coming down the mountain side to the right as I was watching a big buck with a huge rack on the left!