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.
Magic bullets, eh? 
And they're pretty powerful.
رصاص سحريّ؟ وهو قويّ جداً
Ein magisches Geschoss?
Sieht stark aus.
Balas mágicas, ¿eh? Y muy poderosas.
Balas mágicas, ¿eh? Y muy poderosas.
Une boule d’énergie… Pas mal !
Una bomba magica? Sembra piuttosto potente.
Um projétil mágico? E parece poderoso.
Заряд маны?
И достаточно мощный!