Assassination Classroon: Irina Jelavic (Episode 10)

This is where Irina was caught off guard by retired Russian assassin, Lovro Brovski, her former master, who advised her to give up trying to kill Koro-sensei but instead, Koro-sensei himself proposed a match between Irina and Lovro to see who will be the first to "kill" Karasuma with a rubber knife, offering Karasuma his own incentive should neither of them win.