Buying a Panamera that is on loan to Hilal Bank

[salkharr]

Hello, need help, found the car I want, the seller has a loan on it, unable to pay it off for me to move it to my name, asking me to go with him to bank, pay it down, he will hand me a check from his account for the same account until the release letter is ready, then we go and register it in my name and I give him the check back. Is this normal? How can I guarantee that he won't get the car released and go sell it again?, and then I'm stuck with a bounced check I have to chase in courts?

Any advise would be appreciated..

Thanks,
Sam