Board Thread:General Discussion/@comment-2001:4CA0:0:F226:5DC3:F3C1:2652:DAA2-20170826174850/@comment-5780397-20171104001653

That would be some extreme Transmutation though.

They did, when they meet Yunju. Kite knows there are two more ants, which Killua deduces is thanks to his En. However, since Pitou's En is the only one with an irregular shape, and since Gon and Killua were close to Kite all the time, they must have been within the radius of his En when he used it, yet felt nothing (while En is supposed to give you a feeling, as proven by Kite's intention to touch Pitou's tendril and Zeno's reaction, as described by Knuckle and the narrator respectively).