Testicle Fingers (It's true though, isn't it)
Nagisa could've, no, he would've, no, wrong again. He did laugh - a lot. (when he thought he was alone.) This day was turning out to be the complete anime package, and to add to the humour, he actually did the thing where you put your hand up to your eyes while you laugh like a maniac. That was mostly for the hell of it, though. And painfully cliché.
But it was so hysterical, so mad, so completely insane, he even slightly scared himself. At least he made it look good. Credit to him. Why was he laughing, in a forest, scaring away all the deer for miles like a madman, you ask? Because those idiots are so oblivious, it's not even funny. To the extent where it is. Him and Karma must've snuck a hundred knowing glances, and not even the amazing, skilled Karasuma noticed. He swears that man is all bark.
He thinks he's confusing himself.
Still, he laughs until his throat is raw, and his side's ache dully, and there are tears in his eyes. The system warns him that he's in danger, because clearly, there's an enemy nearby (It's just because of how much damage the laughing is doing). Maybe he's the enemy? That's too existential to ask right now. It only makes him laugh more. Stupid people.
Once he'd done with his little... episode, he regains composure, and goes to meet Karma, to set the trap. Spoiler Alert: The trap isn't actually for the octopus. As he walks, Nagisa thinks he should come up with a better, more demeaning name for the octopus, since Karma practically reached into his mind and stole it. He never said it out loud, so that's definitely what happened.
It's fine, that fucking octopus ruined his chances of becoming a mage. Dick.
He lets out another lung destroying laugh, wheezing out, "Tentical Rapist", and he knows he been in too many YouTube comment sections. He feels immature now. He wipes away the tears of laughter, and starts running, because he's already late...
...Or not, because Karma's taken it upon himself to get all chatty with the fishy (pun intended. Octopus, get it?) shit. That's a good one, he's keeping that. He should start a book, and label it, "Korosensei weaknesses" to throw people off. Yeah, he'll do that.
He's pulled out of his somewhat childish thoughts by commotion, and he realises that Karma's become competent, and jumped. One suicidal point to Karma, one less for Nagisa. Nagisa's wining. In the homicide section, though, it's a draw.
Once the Ink Sac flies off the side to save his "precious" student (we all know he's just trying too hard to play teacher), Nagisa tapps the grass with his foot. It was actually more like a kick you'd use to give someone concussion, but he's too excited to care. He's almost buzzing with it.
A tent like structure bounces up around him, and then sits in place on the cliff, only blowing around every now and then in the wind. It's not a fucking ancient stone castle. The Yellow Turd flies up onto the cliff with Karma, only to run straight into the tent... with Karma. A sheet falls down behind him, and he's trapped.
Hopefully, Karma didn't drop the knife when he fell. He'd never hear the last of it. The red-head lunges forward, slicing and slashing at air, Testicle Fingers dodging every attack thrown his way, apart from when he backs up against one of the sides of the tent, and his skin (goo) starts to melt away.
He's cornered, he can't get out, but he doesn't panic. Nagisa has no idea why, standing to the side in the tent, (wishing he had popcorn), but realises that it doesn't actually effect the plan, so he doesn't care. He's thoroughly amused.
At least he gets the facial expressions right. Hopeful with a pinch of "I know this isn't going to work, but I'm a childish person, with childish dreams". It is going to work, but the Bouncy-ball Head doesn't know he knows, so he has to fake it till' he makes it. (Which he will) (make it, not fake it, that would be extremely anti-climactic)
Karma trips on a tree root, falls with a dignified "oof", and drops the knife. Said knife goes flying through the air, hits the curtain, and sends it swaying around. Giving. The. Octopus. A. Way. Out.
He takes it, and the next thing Nagisa knows, he and Karma are stood outside the swaying tent, looking like guilty criminals. Octopus is only now healing his wounded tenticles, (there were a lot) and Nagisa declares this attempt a sucess, because that's a lota damage.
"I'm proud, genius idea, fufufu, care to explain how you pulled it off?" He looks at Karma for an answer, expecting him to be the genius behind it. Nagisa doesn't know if he should be hurt or flattered. His acting skills are a ten, at least.
"Don't look at me, octopus, Nagisa was the one who thought up the whole thing" Karma says, flipping a knife around in his hand, and smirking at the blue haired boy. Nagisa blushes, (it was genuine, and he doesn't know why) and tries to act humble. In reality, he wants to boast himself to death.
It really was genius, wasn't it? More so than anyone here would understand.
"O-oh, it wasn't anything special. I thought of it when I was shopping, I saw a tent that blew itself up with the press of a button, and I melted some of these knives down and wiped it onto the curtains. It worked well, didn't it" He smiled sweetly, not to be nice or cute, but because, yes, it worked very well. He knows because he eyes the trees in the distance, discretely.
"That was amazing, Nagisa, good job" He gets a pat on his head, and he regrets getting the "Testicle fingers" in his head, because now he feels sick. It's so true, though.
"T-thanks"
Goddam right it was.
It was a complete sucess, he did everything he needed to do, because one of his self-made challenges pops up on the screen, with a green "completed" icon.
Like he said before. Koro-sensei was never the target to begin with.