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.
That's just a mere fraction of
the energy that I have accumulated.
هذا مجرّد جزء بسيط من الطاقة  
التي كنتُ قد جمعتُها
Das ist bloß ein winziger Teil der Kraft,
die ich in mir gesammelt habe.
Es solo una pequeña parte
de la energía que acumulé.
Es solo una pequeña parte
de la energía que acumulé.
Je ne leur avais transmis
qu’une infime partie de mon énergie.
Ho dato loro nulla più che una minuscola frazione 
dell'energia che ho accumulato.
É só uma fração da energia 
que eu tinha acumulada.
У них лишь жалкая толика
накопленной у меня энергии,