They'd better pay him off and pull him in as fast as they can because he just did for $300 what thier fancy "movie money" accounting claims takes millions to do.
Any amount of money would be would be worth it to them to keep him from making another.
Any amount of money would be would be worth it to them to keep him from making another.
They did credit the original composer so no harm, no foul - he'll probably get offered the job if a film goes on to be made, or else get a credit as 'music consultant' and a gratuity check without actually having to do anything.