Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru. So Rimuru proposes a series of mock battles with each of them to ascertain their abilities and allow them to let off steam.
As you have just learned through 
experience, I am strong!
!كما تعلّمتم للتو من خلال التجربة، أنا قويّ
Wie ihr selbst gemerkt habt,
bin ich echt stark.
Como vieron por experiencia, soy fuerte.
Como habéis experimentado, soy fuerte.
Comme vous avez pu le constater,
je suis très fort !
Proprio come avete potuto constatare,
Como acabam se sentir na pele,
eu sou forte!
Как вы уже и сами оценили…
я очень силён.