Gon, Kurapika and Leorio arrived last to the hunter exam when they were approached by the newbie crusher, Tonpa. He told the three all the basics of the exam but pointed out you and Hisoka specifically. He said that you two were the ones to fear in the exam, everyone else was all bark no bite.

You and Hisoka were both from the phantom troupe so you knew each other fairly well, of course you two were the only ones in the hall to know that. You stood together silently neither of you speaking as Hisoka was shifting his cards looking around. You just stood there.

Killua is also participating in the exam however they are yet to meet this boy.