Percy Jackson and Harry Potter crossover

Sometimes, Having Brains is Useful

They didn't get far before the other members of the Order caught up. The kind-looking one with scars ripped across his face--scars blending into purple semi-circles beneath his eyes--clasped onto Sirius's arms and subtly told him that he had gotten Snape into a mumbling, angry mess.

Sirius simply said, "good", and then slowly allowed Remus (as Percy was introduced) to calm him down before they were rushing off again, cloak billowing behind.

If Percy wasn't so distracted by the thought of Harry's in danger, Hermione's in danger, Luna's in danger. Ron's in danger. Neville's in danger. Ginny's in danger. Harry's in danger . . . , he might've been detracted by the utter dramatics of the cloaks.

Fortunately, or unfortunately, he was. 

"Where to?"

"Department of Mysteries."

Barely paying attention to his surroundings--which must've been a first for him, wow--Percy tapped his foot and twirled his wand and twirled Riptide and tried to will everything to go fasterfasterfaster.

By the time they reached their destination, Percy's body had calmed and his mind and gone quiet, like every time he prepared himself for battle. They reached it during its climax, and almost as soon as they entered, blasts of colored lights shot at them from every angle.

Like Star Wars. Except it's on Earth. And magic exists.

Reflexes polished from demigod life, Percy dodged behind the closest upturned desk, drawing out Riptide on instinct and peeking out just so he could get the gist of what was happening.

"Percy?"

He yelped, thumb on the cap of Riptide, just millimeters from pushing it off and decapitating the person before he noticed the familiar red. Ginny Weasley's eyes were large, her flaming hair tangled in knots down her back like she had just risen from bed.

"Ginny!? What's happening? How are you?  Luna!? Is she okay? Where are the others?"

"Percy, Ron and Neville--Ron's got a suffocating brain thing stuck on him, and I dunno where the rest are, Percy you've gotta help them." she glared down at her ankle as if it were personally offending her, and then glanced back up at Percy imploringly.

"Where are they?"

And then he was off running again, dodging behind objects and spells, trying to maneuver around the battle taking place. 

Alright, Ron. Neville. Harry. Hermione.

"STUPEFY!"

Again, Percy swiftly twisted out of the way and back into the carnage of wooden planks and glass balls, catching sight of black robes and blonde hair. He swore as another spell narrowly missed him, close to nipping his arm.

"Ger it off," someone moaned, close to him. Percy whipped around and then almost shrieked.

"Ron!" he rushed toward the Weasley, who thrashed around like he was undergoing a seizure. Percy fell down next to Ron, hands flitting over the disturbing pink-looking intestines.

Brains, Ginny had said.

He threw up a little in his mouth. "Hold on there, mate. Just a sec." He didn't think Ron could hold on for a second longer. But, fortunately, he was able to sense something saturating the organ, something Percy couldn't help but smile at. Finally.

He raised his hand, fingers stretched out to his friend, closed his eyes, and tugged. 

"DON'D GIV ID DO DEM!"