Reborn - Episode 54 "The Guardian of the Cloud's Charge"

After the Cloud ring conflict, Xanxus tries retrieve Gola Mosca.

However, Hibari halts his attempt at retrieval, Mosca goes on a rampage, shooting wildly at everyone friend and foe.

Back at the 9th's house it is revealed that the 9th living there is in fact a fake. Tsuna comes to the rescue of his friends and holds off Mosca at which time Mosca attacks Tsuna only.