Jeff, Rock on and thanks, you did everything you could, your teaching/learning for yourself and your son/and friend. We couldn't ask for more. When the dogs couldn't find anything and labs are well known for finding wounded deer as well ( with training) I doubt this particular animal is down. Watch for him. I have othe recommendations for lights but I won't go into them right now, it's referenced from my blood tracking books and breeder through years of experience handling dogs at night on wounded deer and bear.

Keep up the great work teammate.