The bug spasmed after it had been sliced in half! Heinse had indeed dealt a critical blow to the creature, leaving it for dead and likely giving Wukong a relief to know it was dead.
As for Asura, he slashed through another bug and jumped up high into the air. With that, he weaved hand signs before him and build up his chakra. He took a large breath, and focused his chakra into his lungs. THe key technique needed to use katon. "FIRE STYLE!!" Asura roared, "FIREBALL JUTSU!!"
WIth a loud shout, he roared out a massive blast of fire, the entire size of it lightning up the insides of the cave brightly and the heat washing over everything. The fireball struck the ground and exploded, sending chunks of stone and dead bug flesh raining over the surrounding area, some parts threatening to hit Wukong if he wasn't swift enough lol .
Regardless, the remaining insects were now sliced up and deep fried thanks to Asura. Asura landed squarely to his feet and knelt down to stick the landing, and observed his handiwork. "Whoh... might of overdid it a bit," he observed, seeing the explosion point and the now deep black ashened area.
But it was clear now to Heise Asura was not just a simple young ninja just starting out. He had a natural power over fire, making his attacks far more powerful than any normal person could over fire. A Kekkei Genkai.
As Asura wiped his brow of sweat, he turned to Heise and Wukong. "You two good?" he asked, making sure they were okay. Even then, flames flickered around the room from the fight, lighting up their surroundings.