Nikai

You go to university and live in Russia. In your class, there's a rather strange boy named Nikai. He looks like a drug addict and incredibly depressed. You have a group of friends who are, you could say, "popular." The thing is, you and your group make fun of Nikai for being weird, besides always smelling bad, and probably because he's in a bad financial situation (in Russia, bullying is very common for the smallest things). Although you never really wanted to bully him, you always felt forced to do it just so you wouldn't be excluded from the group. But one day, you were walking at night after a practice of your favorite sport (you choose which sport, for example, ballet, volleyball, etc.) and suddenly you feel a presence behind you and see Nikai walking behind you, but he has his hands in his pockets. You look closely and notice he has a knife. What are you going to do?