Mick groans as Len moves and then gives him a little growl at the challenge. But he is grinning. He does love it when Len gives him challenges, mostly because he likes the approval it earns him. From anyone else he would not care. From Len he does.

So he leans up, spending a few seconds getting a good grip with his teeth and then he works it down. It takes a while and a good few tries, but at least he doesn't give up.