One thing for sure, if it is a jump I Jumpmaster and a spin occurs, intentional or not, there is going to be some serious post-jump investigations and FAA interactions. There is absolutely no excuse for having a jumper exit without a stable platform and without the aircraft continuing on a good glide-path away from the jumpers. I have seen too often mishaps at the door on stable runs let alone unstable ones. If this was intentional then there is absolutely no way that pilot gets a free ride to ever do that again. That being said, I hope that the spin was a mistake and the pilot gets all the extra training necessary before ever carrying jumpers again. It is fortunate that no one was injured, the sky, even more so than the water, is unforgiving of even the smallest mistakes.