As the battle continue Nagisa is getting used to his new found ability and power nagisa realize how fast his reflex are even faster than an avarage human 20 times to be exact and he can somewhat see the world in slow motion whenever his opponent is hitting him he felt thrill of the fight not feeling fear at all until he was kick in the gut through 3 buildings

Nagisa then get up saying

"Ow!! Huh that didn't hurt as much" nagisa then look at the rubble and he saw the thug was surprised he survive that and nagisa think for a moment what's his next move.

nagisa leap to the thug and knee him in the chin before kicking him down the road the thug was angry at nagisa attacks and as nagisa land on the   
ground they both clash all the civilian are in fear and avacuate nagisa was stab multiple time but he endure the pain and keep fighting the thug thought "huh you put up a good fight for being a high schoolers but that reputation ends now!!!" The needle devil stab nagisa in the lung injecting poison causing nagisa to weaken nagisa is getting angry and

And said
"You fight dirty huh? That's not how a fighter fights" nagisa cough out abit of blood as he said for the next 15 minutes they both crash building to building and nagisa got an idea he had to go into hiding and suprise him with a sneak attack nagisa leap and jump to a park lake and wait the thug scream

"GET THE HELL OUT!! WHERE ARE YOU HUH?!! ARE YOU A COWARD AND DECIDE TO RUN AWAY!!!"

Nagisa proceed with the plan and jump out the lake and kick the thug from the back head causing to flung multiple to the ground before creating a crater nagisa laugh saying

"Hah! I knew you'll let your guard down! Now is time I'll give you a beating you'll never forget!" Nagisa leap forward once again managing to cut one of the needle devil thug arm

The thug reply
"You son of a bitch.." the thug slice off nagisa left chainsaw arm and nagisa was mostly in shock they both battling in the park causing massive damage to the area nagisa worried what will happen if the damage was continue with the last of his strength he

used all of his speed cutting the needle devil into pieces even the needle devil thug couldn't react after the victory nagisa passed out from the poison korosensei took notice of the destruction of the city and carry nagisa to bring him to the hospital to remove the poison.

many hours have passed and days went by after 3 days nagisa wake up from his unconsciousness in the hospital with his mother on the chair was in the mix of angered and sadness when nagisa look at his own arm he saw that his arm was healed from injuries he look to his right to saw the news of a devil battle there's zero casualties however the damage was outrageous estimate about 10 to 20 billon dollars

Nagisa felt very guilty that that happen the only couple things he worry about is his indetity gonna go piblic? Or is people gonna investigate and put him for an experiment? He's got a lot on his mind but korosensei using his disguise calming nagisa down telling him that he's put him out the scene as much as he can

Nagisa put a sign of a relieve saying that "I'm glad everything is okay" nagisa walk off the bed and he was not injured anymore and he could walk like it was nothing nagisa look at the hospital window and look at the sunset before looking at his chest saying "tomu.... What type of power did you give me??...." Nagisa untie his button look at his pull cord saying man... You and i can do soo much thing tomu... For these days on nagisa can have a better chance saving korosensei.

(To be continued)