Gladiaros, Hezna, Vaiter

Previously, Black Fog only showed his Red Salamander and Blue Salamander during his confrontation with White Mist. And during his fight against Jean Grey, he only ever used his Red and Blue Salamander when he activated his Dual Beast Integration. In other words, Black Fog hasn't shown his cards yet, and this made Satoshi worry a little bit.

While Satoshi was still unsure whether Black Fog is a Disciple or not, he could tell that he was indeed strong. He didn't even break a sweat when he fought against Jean Grey, whereas Satoshi barely won a round against him. It was clear that Black Fog still has a lot of tricks up his sleeves and Satoshi knew he wouldn't think twice about using them when he's backed into a corner.