He tracks every point hit on his body, mentally subtracting them from 501.
The episode begins with Killua confronting , an octopus-type Chimera Ant who utilizes a human host for his sniper abilities. In a moment of unexpected empathy, Killua chooses to spare Ikalgo, even saving him from being eaten by his own subordinates. Hunter X Hunter 2011 Episode 101
When the brother throws a dart on a real board at their base, a "dart fish" materializes only at the moment of impact on Killua's corresponding body part. He tracks every point hit on his body,
Killua is systematically torn apart, suffering massive blood loss as he struggles to comprehend the rules of this invisible game. Strategy Over Raw Power When the brother throws a dart on a
Killua’s victory is one of the most celebrated strategic moments in the series. Relying on his childhood training—where he mastered darts by the age of six—he deduces the exact rules of the "501" game being played.