If I had to guess, this will be where Otobe is officially shut down.
That, or I suspect Kusunoki will show up at last and see the two of them from afar and start sinking further into her uneasy jealousy, trending further toward her "dark self" wherein she'll (eventually, not right this moment) swap narrative roles with Hebikawa.
Dunno if we'll even see Snek during the festival 'arc', as a result; this might be the focal point of Kusunoki and Otobe's friendly rivalry becoming not-so-friendly.
Though it would set up a chance for her to also have a Festival Moment with either Keisuke or Kusunoki, further pushing Hebikawa along toward the "light" through wholesome interactions that leave her further questioning herself, I guess.