Just to clarify, you were able to avoid being scammed or is the dispute still open? Has hamsterfly gone silent or is pretending that a Western Union payment was sent already? You should try to avoid Western Union, but it's most convenient in some parts of the world I guess.
I think he meant that hamsterfly faked a pm from ognasty. This happens occassionally that scammers try to do that. So never send to a quoted address, only to an address the escrow sent directly. (Check that the escrows name is the real one too.)