so, marisa and reimu bullied/tortured the patchouli, which was liked/befriended by flan and thus they are getting some well deserved "DEATH FROM ABOVE" ?
why flan? you mean remilia, she has the bat/vampire wings! And it like remilia catches patchy for food, but then remi's children got killed and so she is parenting patchy. Then she is going for a hunt, but then her wings got teared off by youmu and marisa, which makes her unable to be a predator, so she only is able to give patchy grass. She went home, saw patchy's hat and then the dead patchy. After that i don't really get the connection
(After reading the anko) the cycle of revenge comes full circle. Pity remilia for thinking she can be more than a hated and feared predator yukkuri, and too bad for marisa and the rest of the yukkuri for defying their place in the natural world.