If you think there are only three people in Mukuro's group, then this episode will prove you wrong. Admittedly, there are still some comedic scenes in this episode, but most of it is filled with action and suspense. There's even a scene that highlights Tsuna's self-sacrificing nature. P.S. You'd be as deluded as Yamamoto if you haven't noticed what's odd on Kokuyo's side.