I think Logan put the noose in Imani’s locker. When he was making fun of people who got lynched on page 75, Imani was not tolerating ANY of it and she was infuriated and in the red zone. According to the text Logan mutters “Sorry” but it doesn’t sound like he means it we can infer from this that Loga was mad at Imani. Thus, I think Logan put the noose Imani’s locker.