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.
You can't threaten me 
with something like that.
لا يمكنك تهديدي بشيء كهذا
Damit kannst du mir nicht drohen.
No lo considero una amenaza.
No lo considero una amenaza.
Il ne constitue pas une menace
pour moi.
Non puoi minacciarmi con una cosa simile.
Você não me ameaça com nada disso.
Меня им не испугаешь.