well to me it sounds like a low liver shot, the white hair to me sounds like the belly hair and a shot midways back would cause the deer to hunch over like that. My guess would be dead deer but if you want the meat to be good you better go in the morning. I hope you didnt push it then you could be in real trouble, i wouldnt have tracked it just after an hours wait, waiting until morning would have been the right thing to do but we all make mistakes.