There have been a few times this season when the episode hasn't been just kinda average. Then, the next day or so later, I'll hit the official site and they'll have a deleted scene that's funnier than a lot of the stuff they left in the show. This is one of those instances.
If you thought "The Duel" was somewhat average, then you have gotta check out this scene. And if you really liked the episode, then this scene would've made it that much more funnier.