Hopefully you got lucky and hit one of the main veins back there. He may not bleed externally. You should have left and not went looking for him or your arrow, done that my self, and just pushed him so far I never found him. Live and learn. Keep a watch out for the crows in the next few days. Where ever they are congregating may be where he is. I doubt the meat will be any good, but it can give you some closure.... I think he will die, just hard to say how long it will be... JMO..