Clarkson's hand is on Downie's jersey in that picture, not his helmet you silly goose.
Uh, no. It's on his helmet strap. Watch the video again if you like - it's pretty obvious, and it's a standard Tie Domi tactic that he used for years. Except that Domi was smart enough to keep his elbow up while doing it, so he didn't get nailed with a punch like Clarkson did.