Well my theory is that the OP is either trolling/making up the fact that he is getting scammed or that both you and HBOGo actually scammed him. I am somewhat leaning towards the former as I find it hard to believe that someone would be so stupid to send that much bitcoin with such a little amount of security
He could be making it up to get someone to send first and then he vanishes.
Well I noticed that both transactions in question are funded with an address that has inputs from what appears to be a shared send transaction from blockchain.info. Therefore it would be possible that the OP is simply sending funds to himself and then using shared send to "recycle" funds back to himself.