One of my rainbows refuses her food when she is anywhere near a shed (weeks). Often times her belly hasn't even turned pink yet and she ends up missing several meals. I'm not a snake so I don't know what it feels like when you are going through those cycles, but I guess she just doesn't tolerate whatever feeling it gives her very well. Some are just more sensitive than others

. With balls though, its the time of eyar for this sort of behaviour. It may not have anything to do with his "old skin" at all, but rather have been a coincidence. My 2cp