Pretty misguided and headed off the deep end here pallie. Did someone tell you he's the only one who does this and you jumped at it as gospel? Keep watching for goalies with their masks on during anthems...lots of them do it...Americans, Canadians, what have you. Goalies are freaks of nature, superstitous bastards, head-cases, have their own rhythm, whatever you want to call it.
Roy keeps his on for our anthem and for 'Oh, Canada' too.