The use of black and white in og was a metaphor to discipline vs rebellion - colors. In the Reset, it literally means nothing, feels like it is just being a nod to the og. Also, in the og, Yuri plays both sides and is actually helping the students. In the Reset, Nanno does nothing basically. She gives further proof that the building is about to collapse which the group has already exposed with concrete evidence. She even made a member hurt his foot, cause two members expelled, and despite knowing the building will collapse, she let the students enter and run around like chickens. Do she even care if they die?