A bit of action again

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Cassius hid behind a rock as two fire warriors approached, both of them armed with lasguns. "Wow, you don't see that every day," he said, smiling at the stupidity of black fire warriors carrying lasguns. Ignoring the fire warriors, Cassius placed a proximity charge behind the rock and armed it. Then he waited for a few seconds.
Both the fire warriors came past the rock. The first one pointed out the charge. "What's that?" the first fire warrior asked.
"I have no idea," the other one said as the charge started beeping.
On the other side of the rock, Cassius was running already. It was only a matter of time before the rock exploded.
Both fire warriors loaded their guns. Seeing Cassius running, they began running after him. But before they could move, the rock exploded.
Cassius laughed, hiding in the shadow. He'd knew that no-one would see him. He'd been taught that himself while he was still a guardsman in the Hellaran army.
His past didn't matter right now. What mattered was killing Mordeus, the chaos cultist inquisitor. He jumped out carrying a plasma gun and ran towards a set of metal steps.
His armour was heavy enough to alert even the deafest person. But he didn't care. Cassius had been given orders. He had to follow them.
In the control room, seven Chaos Space Marines were walking about, each of them carrying bolters. Mordeus came in, furious.
"What's wrong?" one of the marines asked, concerned.
Mordeus gave the marine a look.
"...Sir?"
Mordeus nodded. "Sound the alarm, I want people on the dunes."
"Yes, my lord." The marine walked over to a panel and took off his helmet. The marine's face was distorted as if he'd over-aged. His eyes were incredibly black.
Five fire warriors were sitting down in the Ion cannon room. They suddenly heard a voice. "Attention all units," it said. "Intruders on the dunes. Level seven response required."
"That'll be us," the first fire warrior said, getting up. The other fire warriors got up too, charging their guns.
Magus loaded a missile launcher. He had two other Space Marines with him, one armed with a storm bolter. "We need to get up on to the sand rock," he said. "That way, I'll get a clear shot at the tower. After the diversion, I can get Cassius across with no problems at all."
The Space marine with the storm bolter nodded and aimed upwards to two incoming fire warriors. He fired, bursting bolter rounds at the fore warriors killing them instantly.
The fire warriors dropped a rail rifle and a pulse carbine. Magus, ignoring their weapons, climbed up on to the sand rock. He took precise aim at the tower with his rocket launcher.
Cassius ran through the streets. He came to a landing pad. A second later, he found it was covered with debris. Magus had started the distraction. Now Cassius had to run.
He ducked in to a building and stripped down to wires. He'd now be able to run twice as fast as he could with his power armour on. Leaving the power armour in a safe place. Cassius loaded his plasma gun and ran across the landing pad.
At least twenty fire warriors arrived at the scene. One fire warrior suddenly collapsed. Either one of the survivors had managed to get up on a building or it was a space marine.
It didn't matter right now. Nothing mattered. Cassius ran towards a checkpoint and dropped his plasma gun, picking out a pair of bolt pistols from an armoury close by.
He was now aboe to run a bit faster. Power of weaponry was less important than speed at this time. He put his mind off it and started running again.
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