I don't see in any of these photos where the guy ever grabbed the face mask, ear hole, or under the helmet. Just because the guy's hand is on the helmet doesn't mean he's grabbing it. To be a penalty it must be grabbed.
I've heard many say that on the BYUtv broadcast it's a clear penalty but I haven't seen those angles (I saw it live and on ESPN) - these pics look like the defender is around the helmet but never grabbing it.
http://www.sltrib.com/csp/cms/sites/sltrib/pages/slidegallery.csp?cid=58436864&pid=6526806