To be fair, takumi isn't exactly new to plot twists or anyway to meeting expectations differently than what is anticipated, so I'm really looking forward to Marisa and Reimu successfully repelling Flandre, and the "annihilation" is something completely unrelated.
Jumping attack is very stupid, Flan is flying predator, she really knows how to counter these attacks.
In "Untitled July 2020 (takumi)", Marisha can take three stomps, but in Mohawk sensei, Mohawk can stomp an full fledged adult yukkuri to death with one hit. Takumi makes Yukkuris in this story have strong body than normal ones, Reimu can throw a rock with incredible accuracy and strength.
Anyway, I do hope they will die in the most painful way. I'm sorry for my harsh words, but I can't help feeling joy when watching yukkuris get tortured to death.
I hope Takumi is a cute girl. :))
p/s: I think Flan will use ko as meat shield, ko dies. The parents are forced to retreat due to wounds, Reimu gets new little shit - they fucked, remember?