You wrote future murder victim wrong.let's go! more rival
Personally I feel like it was there to cover HIzumi's expression so the reader can only wonder what expression she's going to make hearing all that.I love the way the speech bubbles almost seemed to take up literal space in the room. With Uzume's bragging completely covering Hizumi up, as if she were physically erasing her, and Hizumi's speech pushing Uzume away as she retaliated with her own accomplishments.