It's the rainy season; it's been raining for days, and the humidity is very high. Because of this, the koReimu in the tent (the one to the far right) has gotten sick (moldy).
A Mister Human shows up, and Marisa begs him - in an astonishingly respectful way - to give medicine to her little one. Anon knows that a single dose of medicine wouldn't be enough; mold grows tendrils inwards. The only way to get rid of the mold is either a continued course of anti-fungal medication (pills for athlete's foot) OR peeling open and scraping the infected area clean of fungus.
Willing to do neither, Anon decides to troll. He pulls out a can of orange juice, pops the top, pours it on the ground, and says "Come get it befor the rain washes it away!"
Marisa goes for it, and licks the ground trying to get the juice. All she gets is a mouthful of dirt, and her back gets injured because of the hard rain.Sitting in the rain screws up her "feet", so she can't move.
Brave Baby Marisa tries to save "Daddy", but fails because of the rain. Her feet melt in a puddle.
Anon abuses the survivors to death.