i can offer you 2 BTC if you bring me the 6 BTC
The debtor is known, but you have to send in advance, because you are a liar.
Do you think anyone is actually dumb enough to send you 2BTC in advance so you get 6BTC back from someone who scammed them?
Are your morals so low that you're trying to scam people who were already scammed
This is exactly what they do: they rely on the despair of cheated people to extort more money from them.
Low life scammer in my opinion.