It's completely normal that he should do that. There shedding process involves a return to a "normal" look about 48 hours before the actual shedding occurs. Here's a great link to understand the whole shedding process as well as another one for if the shed goes wrong. Hope they are helpful.

http://www.ball-pythons.net/forums/s...ad.php?t=28794

http://www.ball-pythons.net/forums/s...ad.php?t=43403