I a guy who wanted to work on short film of mine was doing a CGI effect to see if it could be done. However I was under the impression that this test FX was just a run through to practice with getting it right before the short. But now he's asking for payment, on the test shot. I will be happy discuss payment on the FX of the feature, but I thought the test shot was just to see if he could do it well enough. Am I being fair, or how should I handle this? Thanks.