Cain must subjugate some bandits in order to advance to rank A in the guild. His handling of the quest makes his senior adventurers worry that he doesn't fit in at the academy, so they come up with a plan to help.
Oh... So that's how he took 
out the bandits so easily.
إذاً هكذا قضى على قطّاع الطرق بسهولة
Oh... Ecco perché ha sconfitto i banditi
così facilmente.
Ah... Por isso ele acabou
rapidinho com os ladrões.
О... вот почему он так легко
 справился с бандитами.