Exactly. I am sufficiently certain that rabiow12 is one of the players who abused this vulnerability. and very likely a liar.
Any evidences to back-up your claims ? If he is one who abused the vulnerability,wouldn't he take the profits and disappear instead of demanding the coins which he genuinely lost ? If you scroll back a few pages,secondstrade says they lost about 9 bitcoins and they won't be refunding anybody.Doesn't make sense to me.It is basically their fault.And on-topic they haven't replied to rabiow's claims with any logical reasons.Calling him a scammer doesn't make him one.
Secondstrade is a scammer, very obvious, like you said, they don't want to pay 9 bitcoin.