Didn't look terribly bad to me, however at the end of the day if you are outclassing a kid and it's this late in the season, why not just get the match over with and rest up for the next one? If it is an issue with "getting a workout to make weight later" which I have heard of kids doing that, then pin him fast and run for the next hour or 2.

In hindsight though...I think the other kid didn't know what to do when his arm was trapped so it got awkward. Watch a real good kid against a not so talented one....I have seen a lot of injuries to the better kid due to the awkwardness of the lesser skilled guy who may go the wrong way on a move.