For safety, never share your wallet address or bank details with anyone, even a friend, for money that you can't verify how they obtained. No matter the percentage that will be given to you, this might be a trap that could lead you to financial fraud.
I have also witnessed something like that when someone. Sometimes it goes the other way when someone doesn't want to send money to somebody using their direct account, they rather wants to send such money using your account. And so they prefer to transfer the money from their account to your own account then from your account they send to who they are transferring to. When you notice something like that with promise of high reward, don't fall for it because it is not a genuine transaction. It could be a shady deal somewhere that you don't know and will implicate you.
Now here is what actually happened, the guys that called him defrauded someone and decided to use his opay,how the got the opay account which is his phone number, he didn't know, so they called him with good tune so that he'll send them the money and who knows if he had not called me what would've become of him, may be he would've paid a double or that amount to the person the defrauded and also go in for it, moral lesson, we should be very careful, I think this information should also be shared to our relatives to understand that scam has gotten to another level so that every one will know how to play safe out there.
When we get such suspected fiat, we need to make entry or report to the nearest police station so that we exonerate ourselves of the issue that will come thereafter because certainly someone will come for the money as it must be traced and who will come for it is what we don't know. Playing safe is always a step ahead.