He might have made a little noise during the shed. Keep an eye on him he may be fine. Handle him and see if has any trouble breathing. They usually increase their breathing when being handled(although he's pretty mellow) and you can see the flem build up or hear wheezing. If you want I can come by and take a look at him. Unfortunatly I got alot of experience last year with an RI. But once again he just may have been whistling through his shed.