After his talk with Belzeebub, Thirteen immediately returned to Rocky's Mobile Fortress.
Right now, the three Earth Dragons might be in grave danger, so he prioritized telling them to retreat first before they got entangled with the Monster who was only hiding its true strength.
Fortunately, the worst-case scenario didn't happen yet, and the three Earth Dragons received Thirteen's warning in time.
The three of them immediately retreated and regrouped with Rocky, who had already recovered the bolts that Thirteen had fired at the monster during their first battle.
"A Peak Majin King," Rogg frowned. "Zion, this battle might be more difficult than we initially expected."
"I agree," Thirteen replied. "If not for the fact that I received credible information that Orochi had developed the habit of hiding its true Rank when fighting monsters of the same rank, we might have been taken by complete surprise."