confusion

I'm also confused

Since Matsuri mentioned that mei's pace is way too slow in yuzu's relationship, yuzu stayed with Mei inside the elevator to at least make things go faster. Even if it was a small step, it meant a lot for those two since they don't hang out in school. Plus, there might have been some tension between them as Mei wanting to do more than just stand there. Hence her sort of chasing yuzu after yuzu left.