When Hinata went berserk, the man in black-Jiraiya-immediately realized things had gotten serious. Her power had surged too much at once, causing her to lose consciousness.
Jiraiya swiftly formed hand seals. "Summoning Jutsu: Toad Mouth Binding Technique!" In an instant, everything around them turned into fleshy walls, enclosing him and Hinata.
Jiraiya pressed a hand against a fleshy wall and launched his attack. The walls around Hinata immediately wrapped around her. Looking at her enclosed form, he asked uncertainly, "Did that do it?" No sooner had he spoken than a surge of power shredded the surrounding walls. Even his black cloak was torn into strips by the wind pressure rushing toward him.
The instant Jiraiya felt the wind pressure, he used the Body Flicker Technique to escape. Looking down at his tattered black clothing, he simply tore it off. Hinata was unconscious now anyway, so he did not have to worry about her recognizing him.
Still shaken, Jiraiya looked at Hinata and silently counted himself lucky. Good thing I was fast. Otherwise, even if I survived, I'd be half dead. But what do I do now? What a headache. He let out a heavy sigh.
Then Hinata attacked. She raised both hands and struck toward Jiraiya through the air. An incredibly powerful shock wave of wind pressure hurtled toward him, destroying everything in its path. Seeing its power, Jiraiya hurriedly formed hand seals. "Summoning Jutsu: Toad Mouth Binding Technique!" He immediately enclosed himself in the walls of a toad's esophagus and stomach to defend against the shock wave.
The shock wave struck Jiraiya's fleshy barrier, tearing it to pieces. When he emerged, he had already entered Sage Mode.
Jiraiya secretly breathed a sigh of relief. "Good thing I entered Sage Mode in time, or I'd be dead now. That's terrifying.