Sounds to me like you shot low and hit the deer in the leg.That's the only way i could see you getting white hair at that angle.If you had shot thru the deer at exited in the brisket or low on the other side the deer would have been dead on his feet,not acting like nothing happened.Hunting in the rain is tough,I will usually go after a deer right away if it's raining.If you wait you won't have a trail anyway.
Goodluck,
Billy

WHACKEM N STACKEM