RE: Deer runing into things that don't give.
Back when I was drivin an 18-wheeler, I saw deer run into fences several times. it would just knock them down, and they'd get up and either go the other way, or jump the fence. I suppose it's possible his deer ran into a tree if he was disoreinted from the shot, but out of all the deer I've killed, I've never seen one do it.