It occurs to him that he is touching Anders' waist and telling him to spread his feet and bend his knees. This is not what he would have expected to be doing when he said those things to Anders.

"All right. You'll want to slide one foot at a time, with your toes pointed just a little outward. What I wouldn't give for skates. Let me show you."

He demonstrates, bobbling a little over the uneven parts of the ice.