"Swordsmanship," Yamamoto answered. "My father taught me first, but then you took over." He continued to beam at Squalo. "Remember our first camping trip? You came in and beat me unconscious and threw me over your shoulder to take me into the woods where we tried out best to kill each other until nightfall when you cooked fish for us."

Bomb dropping worked for Tsuna, maybe it'll work for Squalo too.