>>281620553
You're just seeing whatever you want to see and calling it a "fact". This doesn't look like someone who is standing up. It looks much more like a drawing of someone who is walking in.
Generally, when someone stands up , there is some sort of "effect" displayed along with it.
It's just as valid to say that the other Fumiko was in hiding (like she did this chapter) and that she walked in at the opportune moment.