At the same time, Older Sister faltered and had to dodge the next wave of heat with a sideways roll.
When she landed, several tiny holes had been scorched into the hem of her clothes.
Her expression darkened.
"Wasn't his Martial Soul related to lightning? How can he cause fiery explosions?"
Xiao Wu seized the opening.
She launched a sneak attack on Qin Yun.
She fired the Godly Zhuge Crossbow at his back.
But something stopped Xiao Wu's bolt a foot away from Qin Yun.
Qin Yun had been watching out for her all along.
He had formed an invisible wall of helium in front of himself.
The bolt struck it without a sound.
Its tip hung against the wall for half a heartbeat.
Then a soft, invisible force pushed it aside, sending it tumbling onto the arena tiles.
Qin Yun never even looked back.
Xiao Wu's smile froze.
Her mind raced. She quickly hid the Godly Zhuge Crossbow behind her back and forced a smile even less convincing than a sob.
"Oh, sorry, sorry!"
"My hand slipped! I couldn't hold the crossbow steady, and the shot went wide!"
She edged half a step backward as she spoke.
With both hands behind her back and her eyes darting about, she looked guilty as sin.
Only then did Qin Yun turn his head and glance at her.
It was no fierce glare.
Just a calm, searching look that said, Do you really think I believe that?
More than ten meters separated him from the siblings.
How could an ordinary shot go "wide" at that angle?
It had clearly been aimed at a vital spot on his back.
Qin Yun ignored her.
He turned his gaze back to the siblings opposite him as if nothing had happened.
But the index finger of his left hand twitched at his side.
Three explosions went off at once.
The first erupted three inches in front of Xiao Wu's toes. A scorching wave swept past her skirt and singed the tip of her scorpion braid into a slight curl;
The second struck beside Older Sister's serpent shadow, twisting the blue-gray apparition so violently it nearly broke apart;
The third burst in front of Younger Brother just as he steadied himself. Spiderweb cracks spread across his stone armor, and fragments sprayed everywhere.
The three blasts nearly merged into one long roar.
Xiao Wu staggered backward.
Her feet left uneven prints as she stumbled, and the last trace of her smile vanished.
The siblings opposite him looked little better.
A red scorch mark spread across Older Sister's arm.
Younger Brother crouched with one hand braced against the floor, thin wisps of charred smoke rising from the cracks in his stone armor.
The hydrogen explosions Qin Yun had triggered in an instant had limited power.
They could not seriously injure the siblings, but they had bought him time.
He needed to set something else up.
Qin Yun brought his hands together before his chest, palms facing each other. Soul Power surged from his fingertips like a spring.
This time, he summoned no nitrogen and stirred no oxygen.
Instead, he separated large amounts of yellow-green chlorine gas from the air.
As the gas poured forth with his Soul Power, a pale green haze seemed to spread over the entire arena.
Under the soul lamps, it gleamed with an eerie, metallic chill.
The chlorine gas had a sharp, acrid smell.
Xiao Wu was the first to wrinkle her nose. The fumes made her cough twice;
Older Sister instinctively covered her mouth and nose, wariness flashing in her eyes.
"Is this gas poisonous?"
Older Sister spoke under her breath.
But to Qin Yun, the chlorine gas was far more than a poisonous fog.
It supported combustion far more strongly than oxygen.
Igniting hydrogen in chlorine-rich air would make the reaction several times more violent.
This would no longer be a controlled flare-up. It would be a devastating blast.
Qin Yun rubbed his fingertips together.
He used the same method as before to ignite the hydrogen.
BOOM—!
A detonation far heavier than any before it erupted at the center of the arena.
The pale green chlorine gas and hydrogen ignited, bursting into a blinding white fireball.
It expanded rapidly from the center of the blast, driving a wave of heat and pressure outward into the arena's protective barrier.
The entire arena shuddered.
Younger Brother instinctively activated his fourth soul skill to defend himself.
His stone armor thickened rapidly in the blast. Massive layers of rock piled up around him, barely stopping the shock wave head-on.
But the explosions did not stop there.
A second wave followed the first.
Then a third, a fourth...
The outer layers of his stone armor shattered one after another. Fragments rained onto the arena floor.
The shock waves drove him back three steps. His knees buckled, and he dropped to one knee.
Qin Yun clearly had not forgotten the little rabbit who had fired at him from behind.
Another explosion struck precisely three feet from Xiao Wu's side.
She had only just found her footing when the blast went off beside her ear.
The shock wave slammed into her back and shoved her half a step forward.
Without the Soft Bone Rabbit Martial Soul's natural flexibility and agility, she would have fallen flat.
Her pupils contracted. She stamped her toes against the floor and activated her third soul skill, teleportation.
Her figure faded into a faint afterimage.
She reappeared at the other end of the arena, narrowly escaping the blast's lingering force.
But she landed unsteadily, and a sharp, acidic sting surged up her throat.
The fumes poured down her windpipe and into her lungs. She doubled over, coughing hard enough to bring tears to her eyes.
Green toxic fog still filled the arena.
She had escaped the explosion, but not the chlorine gas that filled every inch of air or the hydrogen chloride it had produced.
Qin Yun glanced at her doubled over and coughing, his expression unchanged.
He had always lived by one rule: treat him with respect, and he would return it tenfold;
Lay a finger on him, and he would repay it in kind.
Show mercy because she was pretty?
Not a chance.
If she dared fire a concealed weapon at his back during a two-on-two arena match, she had to be ready for payback.
He even copied her tone, speaking flatly.
"Sorry. That blast went wide."
As soon as he finished speaking, another explosion erupted beside the spot where Xiao Wu had just regained her footing.
It did not hit her directly.
But it pushed a denser cloud of toxic fog into her face. She broke into another violent coughing fit and curled in on herself.
On the other side of the arena.
The siblings had been driven to the edge by the relentless explosions and the chlorine gas filling the arena.
Most of Younger Brother's stone armor had shattered. Older Sister's Azure-Scaled Snake apparition had retreated around her arm, its body dim. She was clearly nearly out of Soul Power.
They exchanged a glance and saw the same desire to retreat in each other's eyes.
They had come to the arena to earn points and hone their soul skills.
Not to risk their lives against a monster who could spread toxic fog and lay explosive traps across most of the arena.
And they had noticed something else.
Qin Yun had not only attacked them. He had not spared the girl he had brought into the arena, either.
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