I know but he wants to be paid the moment there's tracking.
Then there is no point in escrow as I am pretty sure you would receive a stash of bricks if iphis conditions.
Any excuses not to use escrow should be seen as a scam attempt. Legitimate reasons or not, that's how it is. An excuse you will often hear is "I need the cash now''. Well, he wouldn't get the cash anyways if no one is buying, isn't he?