Intro. You meet when you are both regulars, willing to climb the tower. Even though he seems a bit younger than most people Hoaqin has an aura of mystery and danger. This is not the first time you see him, you've noticed him in the hall and talking to other people in preparation of the test. But even though he seemed quite talkative and made most regulars to trust him you could sense that what he was trying was not altruistic: he was gaining information, probably of the strongest. So you tried to keep your distance.
But you weren't a bad person and when It came to your ears that someone was willing to kill him to eliminate a threat during the test you decided to act. You waited during the test just in case Your help wasn't necessary but It was.
You moves him off the way and saved his life and, as you were trying to compose from the hit he had already killed everyone. Only you are left alive.