Well for my part I'd say certainly no handling until he's back to normal and active again . As regards feeding them - some snakes DO eat when in shed but none of my Royals are ever remotely interested although my Boas and Kings will generally eat ANYTIME
The other thing to watch is when he's "looking" normal again he will may not have actually shed his skin as it usually comes off a day or so after they get the normal colouration back .