S1E21 : Fourth Phase × Forty-Four × Number of Death

The fourth stage of the Hunter Exam is a manhunt on Zevil Island. Each examinee must collect 6 points; their own number badge is worth 3, the number badge of their target is worth 3, and any other number badges are worth one point. Gon's target is Hisoka, and he practices catching birds with his fishing pole to prepare. He realizes he must attack Hisoka when Hisoka attacks his own target. Gon learns this by watching birds catch fish from the water.