Between unity and the shipwreck the kids would be triggered by a lot since they're heading back to school. People would ask questions and probably not notice the signs before it's too late and a panic is already happening.
I feel like they would have a plan fo this so no one's alone for when it happens.
Like they all just carry walkie talkies with them and get a warning. "The cookies are burning near the history wings and they're burning fast." Meaning the situation is quickly getting worse.
If asked where they went they'll explain in their own unique way to both the teacher and the principal if they're sent down.