Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... 

Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.
Don't worry. You'll be fine if you're with me.
لا تقلق. ستكون بخير ما دمتَ معي
Keine Angst.
Solange ich bei dir bin, ist alles in Ordnung.
Tranquilo. A mi lado estarás a salvo.
Tranquilo. A mi lado estarás a salvo.
Ne t’en fais pas,
tout se passera bien à mes côtés.
Non preoccuparti. Resta con me e tutto andrà bene.
Não se preocupe. Você vai ficar bem comigo.
Не волнуйся.