I was wondering that at first as well, but the other guy in the crowd reveals it is because he dropped his glow stick (and was presumably trying to find it).
Poor Urumin, even when she does catch a dub it ends up being a Pyrrhic victory; sending our boi, Kimiya, to the afterlife and embarrassing herself in the process.
i wonder if she can still be an idol like that. havent seen any strong motivations from her in regards to being an idol. love for kimiya standing out more