Agreed, you really can't tell. Two other young women are also wearing the same style of white shirt. Maybe some kind of uniform? Would seem to indicate a student. But the boy doesn't seem to be wearing any kind of uniform, so I might be totally off base. Edit:  Confirmed a student https://100percentfedup.com/watch-unhinged-student-beats-classmate-over-the-head-with-cleaning-tool-in-second-nasty-attack-this-week-video/