Sorry to hear about this Ric. I know exactly how you feel right now. Trust me, it will hang with you for a while and you will relive that very moment a hundred times over and wish you could go back and have that chance again. The good news for you is that you didn't cobble him up and it sounds like the deer really didn't know what happened. Also, those bucks are still running together which means they aren't going anywhere too far just yet. I think you have a good chance at either one of them still, regardless of what just happened.
2 years ago I missed a 175" 10 pointer from the ground from 23 yards.....I determined that it was the arrow that dropped severely once it got past 20 yards. I was as calm as ever when that buck was closing the distance too, but an equipment malfunction cost me a boone and crockett buck..... Talk about being sick for days and waking up in the middle of the night sweating.......those opportunities don't come along very often that's for sure. But you know what, I kept my head up and stayed with it and on Oct. 25th that year I killed a 162" 12 pointer!
Hang in there man, like I said before you didn't hurt him and a deer is exposed to lots of things in the woods on a daily basis....limbs falling out of trees, lightning, etc. etc.....chances are he won't even change his pattern. If you are confident he didn't see or smell you then I would keep hunting the same stand for the next week or so. If you don't have any sightings, then it's probably because a full moon is coming up and mid October hunting sucks anyway.
If you don't get him before the 3rd week of October, do a little scouting around the 21'st of October and find a fresh scrape line in the general area those bucks are running. Set up near one of those scrapes and I bet you will get a crack at one of the 2 bucks.....by the way, that other buck is a fuggin stud too!
Good luck