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.
I'd be able to easily persuade my 
student who's unconscious there,
سأكون قادراً وبسهولة على إقناع تلميذي
،الغائب عن الوعي هنا
Ich bin in der Lage,
meinen Schüler, der da liegt,
Puedo convencer a mi discípulo
y a los que están afuera.
Puedo convencer a mi discípulo
y a los que hay fuera.
Je pourrai facilement convaincre
mon disciple
Posso essere molto persuasivo
con il mio studente svenuto qui presente
Seria fácil persuadir meu 
discípulo inconsciente aí,
Я легко смогу убедить
и лежащего на полу ученика,