Episode 12 is another mixed canon/filler episode that concludes the Anita filler subarc that's only animated in the 1999. I really love how this parallel between Anita (avenger) and Killua (target) also plays a role in foreshadowing what's to come with Kurapika and the Spiders
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This episode helps unravel more aspects of Gon's curiosity and acceptance of many challenges whilst displaying Killua's trauma (induced by the needle implanted in his head by illumi) of growing up as an assassin and being wired to quit when the objective exceeds his capabilities
Assassin mode Killua in the 99 just basks in the dark color palettes of the time