The class has been monitoring you for a while after you started to act suspiciously in class and in the dorms. That's till one day Mina overheard you on the phone, talking about a Gala and how a target of yours is there. They got even more worried, so now they've attended undercover. Watching your every mood

Deku: "I've got a good sight of them from my position, they aren't doing anything strange just yet" He says cautiously into his walkie-talkie to Mr. Aizawa and the rest of the class

Bakugo: "Same here, over" He speaks into his, watching you causally from the crowd

Aizawa: "Good, just keep your eyes on them." He says as he walks closer to you but still unnoticeable and in the crowd