I've never really wrote fluff before, but i thought i'd give it shot

.
This is a excerpt from a Dark Angels short story about the hunt for a member of The Fallen.
Lost in Darkness
Interrogator-Chaplain Varius jumped out from behind the cover and ran across the battlefield. Following close behind him, 10 members of the Deathwing each equipped with the devastating Thunderhammer and the nigh undestructible Stormshield. They bounded across the dirty urban road towards a heavily reinforced building. Out of the corner of his eye Varius saw a figure in red power armour running towards him.
" Death to the Heretic!!!" He yelled as he shot the Khorne berserker in the face with a plasma pistol. The berserker yelled out enraged and hurled his axe at the chaplain as he slumped to the ground. Varius swung his crosius through the air and broke the chainaxe in half, screaming " For the Emperor!!!"
He continued running towards the heavily reinforced building, intent on capturing the Fallen inside. In a sudden blast of light and heat, Varius was sent flying head over heels. He crashed through a wall of ceramite and landed in a crumpled heap on the ground. But he still stood up and looked around. At the top of one of the derelict buidlings, a guardsman, corrupted by the taint of chaos, sat with a missile launcher. This angered Varius, who hated chaos with a vengeance.
" Kill the Heretical Filth!" He bellowed at the Deathwing Terminators who had come to his aid. Brother Kanotorus turn around and shot his cyclone missile launcher at the guardsman. The entire top storey of the building was leveled and crumbled to the earth below, to the delight of the chaplain.
" Good, good brother. Now, on to the objective!" He immediately started running again towards the building. When they reached the road outside the building, a chaos space marine leaned out of a window.
" Its too late, your Corpse God cannot save you now!" He screamed maniacally as he gestured to the buildings surrounding the Dark Angels.
" Silence Fallen!" Yelled Varius, " We Sons of the Lion are not afraid of your heretical guardsman followers, come with us so you can pay your debt!". The chaos marine laughed at the chaplain,
" You think it is guardsmen in these buildings? No, it is something much, much worst." he said. Then before Varius could yell more prayers to the Emperor, the chaos marine said " I am Mozeon, and I am a Champion of Khorne!" Suddenly a battle cry could be heard from the buildings,
"Blood For The Blood God!!!!!" And out came dozens of Khorne Berserkers.
" Death to the Heretic, For the Imperium!" Answered Varius as he started firing his plasma pistol into the mass of red.
The Deathwing stood in a ring, shields out, waiting for the impact of the Khorne berserkers attack. Just as the berserkers were about to reach their lines, the terminators all adopted a defensive stance and swung their thunderhammer at the ground. A sonic boom rippled out of the circle, throwing berserkers into the air, and into each other. The chaplain, still shouting litanies of hate stood with the terminators, shooting at the berserkers. Finally, the first berserkers reached the Dark Angels. One swung a gigantic, archaic chainaxe at Varius who dodged the swing and crushed the berserker's helmet with one fell swoop, causing the berserker to slump to the ground. " You are no match for me, heretics!"
All around them the battle raged on, berserker after berserker being felled by the terminators. Varius looked into the crowd of red and saw a large figure emerging. A berserker, with an extra arm, a chaotic gift from his heretical god, walked towards him.
" I do not fear you, chaos filth!" said Varius as he took up a defensive posture. He ran towards the berserker, holding the crosius with both hands.
" Die!!!" he screamed and swung his crosius through the air, lightning crackling from it. Just as it was about to hit the berserker, it swung both of its arms upward and deflected the blow.
" Death to Chaos!" He screamed as he swung again. This time, the berserker side stepped him and hit him with his pistol. As Varius rolled over, he saw the berserker looming over him, holding his two-handed chainaxe high.
"Blood For The Blo..." started the berserker champion, as a Deathwing, named Apien, ran up behind him and smashed his skull in with his with an almighty blow from his thunderhammer. As the champion fell in a crumpled heap, another berserker ran up behind Brother Apien ad beheaded him in one swift stroke.
"NNNNNOOOOOO!!!!" yelled the chaplain as he shot the berserker in the head. After it had all finished, Varius screamed at the window where the Fallen named Mozeon was standing before. Nothing happened. This enraged the chaplain even more, so he grabbed one the axes off a dead berserker and hurled it at the window. Still nothing. Finally, Varius, who by that time was red with rage and hate, stormed toward the entrance of the building and smashed it open with swing of his crosius. Then he turned to the terminators and said " Follow me brothers, let us capture this Fallen brother so he can be properly dealt with."
Running up the stairs, Varius suddenly realised something, they were running inside the only building that didnt have Berserkers flooding out of it. " It's a trap!!!" He screamed as he was knocked head over heels down the stairs. When he looked up again he saw Mozeon. Though he looked to be only clad in a power armour of some kind, he was huge, even for a Space Marine. " Surprised?" He said, " This," he said gesturing to himself, " is what the dedication of Khorne can do for you." He smiled, " now, its time for your head to become part of my Lord's throne." He leaped down the stairs bardishing a huge twin-bladed power-axe. Varius swung his body out of the way just before the axe imbedded itself into the ground where his head used to be.
I was thinking of entering this into the Black Library open submissions for short story, would it have a chance?
finished editing, C&C badly needed, thanks!