S4·E108 A Man's Box Weapon

Tsuna's family become worried at the amount Tsuna is gone while they continue searching the base. While crawling through an air duct, they run into Baishana and Nigella fighting. Nigella is then beaten by Baishana box weapon, a snake covered in storm flames. Ryohei decides to fight in place of Yamamto and Gokudera and summons his box weapon Kangayuu, a Kangaroo. Back at Tsuna's scene of the battle, Tsuna and Spanner are nowhere to be found.