I'm inclined to think that the watch doesn't actually rewind time, but just creates another version of Yotsuha, therefore the other Yotsuha that went through the other future where Uichi dies is still alive, and this old version of Yotsuha wants to take revenge on her younger self for putting him and herself through so much pain and is the person behind clover
Either from behind by Etou or another of Clover's allies (while Rei distracts him), or from the front by Yotsuha to keep him from going.Bro is gonna get himself jumped.
I think you read the LATAM Spanish translation, that's the Mexican flag.Finally translated! Btw, I read the Italian translation (?) using Google Lens and I can't believe my theory kinda true...