why shouldn't marcotheminer take any loss from this? He failed to secure a signed message and as a result took possession of a hacked account. There is no reason why the OP should have to bear the entire loss
You are right, both had faults and that's why I said, like theymos told, to split this amount equally. I think when selling, marcotheminer will get atleast 0.32
BTC, for that ta happen, it should be traded at 0.64+
BTC.
-MZ