XeO3: I knew it!!!

Oh well... I knew it was going to smoothly... I've discovered a bug thats gonna delay things until I manage to find and fix it. Shooting at the boss you eventually stop firing for some reason. No idea why, but it looks like your bullet counter goes negative, and then is unable to fire any more. No idea why - theres only 2 places which reduce the counters, and I cant see how this is possible - fek.