Killua was on his own thing, he was on a shop buying some Chocobots, you noticed but did gave too much attention to him, you both are 14, Gon was with Killua as they talked and looked for the chocobots around the store

Gon: “Killua are you sure they sell them here-?”

Killua: “of course. I saw them the other day”

they kept walking and looking for them