I think (even) if he wants to come back and regret... he can't, because the 'shame' will be enormous.
This part seems true, and it is unfortunate. I tried to get QS to resolve this with me quietly nearly two months ago via PM. The idea was that perhaps if we talked in private we could figure out how to get along and he could remove his attacks without "losing face", as the expression goes. Unfortunately, he merely restarted his false accusations in his usual inimitable style "you are a scammer, I know this". And then wouldn't reply when I asked him to explain to me, in private, how it is that he thinks he knows so much about a situation he wasn't even present for. After waiting a week and a half for a reply, I had to go back to the only other recourse, asking in public.
I really never expected him to keep doubling-down on the stakes like this. It really seems like each time he's backed into a corner with people saying "QS, why don't you drop this", he brings in a new account to sockpuppet and distract. He's sorta going crazy with it at the moment, you can see that he's posted nearly two pages quoted walls of nonsense, off-topic, randomness into this thread using at least three accounts ("QS_banned"? what is that about?!) in just the last 24 hours.
I also would have never predicted that he would involve the alts that he's using for his escrow-scam-trading into this clearly personal grudge. That is, it seems that no one would have ever known that panthers52 was his alt, and the was trading with it using himself as escrow if he hadn't pulled it into this wild-ass saga. Alas, what do we do now? I admit, I find it hard to believe that he's trusted by anyone with a reasonable head on their shoulders after all these stunts.
As redsn0w says, it seems he's intent on "going down with the ship" like some sorta old sea captain. QS, I know it would be hard, but it
would demonstrate actual character at this point, you could go ahead and right your wrongs here rather than continuing to double-down. You can remove the sockpuppet ratings from troll account
FunFunnyFan, you can delete your negative feedback on me which is merely an echo of long-discredited scammer
TradeFortress and then go about trying to repair your reputation with respect to your shady trading practices. When the house is on fire, it's time to leave the house, don't keep throwing wood on it.