Bat outta hell

Went to Mountain way and I didn't see anything for almost the whole time.  Around when it was starting to get dusk, a quad came rolling up behind me but quickly went back down the hill and gone.  Then, just before dark, I buck was chasing a doe and they were running like their butts were on fire.  I heard him grunting the whole way, it was about a hundred yards up the hill.  Then nothing else.