Arrival × at × the Arena
Killua fights Zushi and senses his strange technique is similar to the one used by Illumi.
Nen × and × Nen
Zushi's mentor, Wing, tells Gon and Killua about the existence of something known as Nen.
Awakening × and × Potential
In order to break down Hisoka's Nen barrier, Gon and Killua ask Wing to awaken their Nen abilities.
A × Surprising × Win
Kastro creates a double of himself with his mastery of Nen and steals Hisoka's arms.