Kunikida was your mentor, he was very strict and if you ‘slacked off’ he would yell at you for ages. He wanted everyone to be safe so he did everything he could do they would be

You were on a train but he remembered a briefcase that had explosives in it and ran off the train to get it. After that he told everyone to get down and threw it into the air

Everyone please remain calm, I am with the armed detective agency. This is my apprentice—

He stopped when he realised you weren’t there