Luna! It's so nice to hear from you again! I was afraid I'd lost you back there. I would like to hear about this emotional roller coaster ride~.
This one was partially inspired by Hufflepuffs finding the best hide and seek places and just popping out of the woodwork during the battle, I don't know whose head canon it was originally, my record is missing the username. I think it was also partially RM's idea, I don't remember. Sorry it's so short!
Blood Bombs
May 2nd, 1998
Post-Hogwarts
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They were most of the way through the reprieve in the fighting when Harry reappeared. Fred and Percy had been whisked away to St. Mungo's along with other grievously wounded.
"Jo," Leili said. Her voice was rough; too much crying.
"Hmm?" Jo hummed.
"Harry's back." Using each other as leverage, the girls stood up.
"Hiya, Harry. We need to borrow you for a minute," Jo said when they reached him.
He'd just pulled his head out of the pensive but was still engrossed in Snape's memories and was trying to resign himself to his fate. Neither can live while the other survives.
"Why do you need me?" Harry asked; the two Hufflepuff girls were starting to freak him out just a little.
"Blood bombs, Harry, Blood bombs. You never went to the graveyard, we did; he didn't take your blood, he took mine. The protection your mother left you, you still have it. Your touch burned Quirrell, therefore, your blood should do the same to Voldemort," Jo explained.
In an effort to distract herself, Leili jumped in, "But it's only a one-shot weapon. The human body has what, 9 pints of blood in it? And if I remember my family dinner discussions well enough, it takes the body a month to recover. So we can't take too much and we have to use it sparingly."
"Let's do it! I'll give you whatever you need," Harry said eagerly. Jo followed and Leili borrowed Lee. She wouldn't bother any of the Weasleys with this harebrained scheme, not while Fred was hurt, not while he still might die.
"We've got less than half an hour. So let's do what we can. We need water balloons and good place from which to launch them. We also need Madame Pomfrey because I am not competent to do this."
The Matron pulled the blood from him into a syringe and then squirted it into a balloon Lee had conjured up. They had originally planned on using a little blood in several balloons but Harry'd come up with the better idea of replicating them and then using the Gemino curse to multiply on contact.
"Find out who has the best aim and pass out the balloons, please?" Leili requested, handing Lee eleven balloons in a basket.
"All right, Harry, you're free to go." And just like that, Harry was gone, only a little woozy. He went into the forest, turned the Resurrection Stone thrice in hand and walked to his anticipated death.
"I should be up there with you," Jo protested after Leili explained her plan to hide in the rafters.
"You're afraid of heights. What are you gonna do if we get caught? Jump? I have the advantage of being a small bird. If I get caught, I can fly down. You're a bear; you'd be trapped up there. I'll be ok. Stay down here."
Jo folded her arms over her chest, hip cocked stubbornly to the sice, "I don't like it. There's no way I'm letting you go up there alone! At least I know that if I jump, I'm going to die when I hit the floor, that takes the fear right out of it."
"The hour is almost up, we don't have a choice."
"You could not go up there!"
In the end, Jo won. It was the best place to drop a balloon on Voldemort's head, it really was. Jo grabbed a broom and she and Leilani flew up to the beam with a balloon and then they waited.