Hunter x Hunter: Season 2, Episode 89
As the battle with Knuckle begins, Gon is told that his Janken technique is fatally flawed - but Gon exploits this weakness, countering as his opponent tries to take advantage. Just as Gon is about to deal a finishing blow, he collapses from exhaustion. With the deadline the next day, the final showdown is looming. As Gon sleeps, Biscuit spars with Killua, after which she explains the nature of his own weakness. She issues an ultimatum - should he lose the next day's battle, he must leave Gon's side.