The process releases an immense surge of Nen felt by Hunters across the area, including the Zodiacs and Ging.
In the episode's final moments, Gon finally locks eyes with his father, Ging, ending his primary quest that began at the start of the series. Watch Hunter X Hunter - 145
Killua’s silent, emotional reaction highlights the heavy toll he endured to save his friend. : The process releases an immense surge of Nen