Hayai vs. Pein

Hayai vs. Pein
This epic battle occurred in the Revival of Akatsuki arc. Hayai was fighting the six bodies of Pein after Sudogaya revived the members of Akatsuki. This was the concluding battle in the arc, and was when Hayai reached his peak in strength. The overview of the battle is here:

Hayai, Saruzen, and Saruhoshi enter the Leaf Village full of hurt and bloody ninja. In the distance, Hayai sees Konohamaru the feet of Pein's bodies, on the edge of defeat. Asura Path rushes towards the injured Hokage, but Hayai intercepts him and killed him with one attack. He challenges Deva Path and draws his sword. God Realm just watches on as his Animal Path summons 7 creatures.

The creatures attack them, but Saruhoshi kills some of them with his dual swords. Hayai uses the Super Great Ball Rasengan to blow away some of the creatures. Pein's giant dog splits and multiplies to overrun Saruhoshi. Hayai jumps and uses the Fire Release: Rasengan. The dogs leap to attack Hayai, but the Rasengan grows into the Fire Release: Big Bang Rasengan and obliterates the dogs. The attack almost swallows up the Peins, but Preta Path absorbs the jutsu. Then, Hayai throws a punch at Preta Path, but Human Realm intercepts him and throws a punch of his own. Hayai's is faster and knocks Human Realm away. Naraka Path comes from the air to attack Hayai, but he jumps and kicks Naraka Path in the chest. Animal Path then unleashes his creatures again directly at the Monkey Sage, but Hayai and Saruhoshi used a fire-wind combination to burn and encircle the animals. Saruzen threw an exploding tag with a kunai and the flame tornado exploded. Seeing the Pein body in the smoke with his Sharingan, Hayai leaped into the smoke with lightning speed. A second later, the body was knocked several feet out of the explosion, and dies. Deva Path claimed that he underestimated his strength.

Hayai told Saruhoshi it was time to use the Blinding Slayer Technique and Saruhoshi throws giant smoke grenades. The smoke covers Preta Path, Human Path, and Naraka Path. In the smoke, Saruhoshi slashes the bodies with his blades combined with wind chakra. He instantly kills Preta Path and Naraka Path and Hayai leaps to attack the Human Path. The smoke clears and Deva Path is suprised to see two bodies dead. From a dark place, Human Path asks where he is. A double Rasengan answers question. Saruhoshi spits out Hayai and a dead Human Path. Deva Path just watches in awe.