Just talked to this person a bit more via PM.

I asked them to show that they actually own BTC. And guess what? They are avoiding that question.

Also they keep avoiding question about escrow.

 And they are keep repeating them self over and over again.

Also they claim that they have big reputation but they don't want to prove it.

And of course they don't want to go first.

I won't say this person is a scammer cuz I wasn't scammed so I don't have any proof that they are. But they certainly act as a one. 

Be very very careful when dealing with them