Since they weren't students in the school, Cosette, Luke, Maxen, and Remo had to stay in the cafe for a couple of hours until all students and teachers leave the premises. Obviously, while they were waiting, they planned out everything they should do. Fortunately, Remo had some information since he knew the delinquents and also knew their secret way out whenever they skip school.
When the sky turned orange and the number of students walking on the street significantly reduced, the four of them execute their mission. Thanks to Remo, they didn't have to go through the school gates and get chased out by the guard. But when they reached the secret passage, the four of them hid because some delinquents — familiar ones with all the bruises on their faces and bodies — were hanging out there.
