It starts Thursday afternoon, in chemistry. The day'd been going fine, up until then; he had to go to work right after classes and that was inherently kind of a bummer but he felt in decent spirits about it.
But by sometime in the middle of class, he learns - he knows - that something horribly wrong is going on. It's... not anything he can put his finger on. But the way the professor is delivering the lecture just sounds so much more -
It hits 2:55 and he books it out of the classroom. He tries very hard to look exactly like he always does, like he's hurrying because he's got to get to work and not because he has to get out of there. He's not sure it works; the looks people are giving him are -
Okay, water fountain, here's one outside, sure, he needs to calm down, just - that'll probably help. He needs to calm down.