Inspired by this thread
I will start a story and then give four options for how it can continue, then the next poster picks one of these options and continues the story for a bit themselves. They give four options on how it can continue further, then the next poster picks on, continues, gives four options and so on.
Other than that, the only rule is just to keep the story apropreate for the setting (e.g. no crossovers with other settings, continuations should be linked to the main story somehow and not one-off random things that are totally unrelated, etc).
Other than that, basically have fun
Hardon Phrass clutched his Naval issue shotgun to his chest and prayed to the God-Emperor. Beneath his feet the deck juddered as the assult pod was winched into position and the armsman winced as he heard a harsh clanking from outside. Arround him, his fellow armsmen muttered their own prayers or conducted their own pre-op rituals as they awaited the assult to begin. Seconds stretched into hours as they waited, and Phrass glanced nervously at the airlock in front of him. The assult pod was little more than a metal box fired, torpedo-like, at the enemy vessel where the intention was that it would pierce the ship's hull and the airlock would open and its passengers would disgorge down the boarding ramp.
Phrass could hear motors whirring as the pod slid along greased rails into the firing chamber, and worriedly his fingered the piping on his rebreather, checking that it was secure and connected. Abruptly, the lighting inside the pod cut out, and moments later was replaced by the harsh red glow of the emergancy luminators. With a roar, the pod lurched forwards and Phrass was glad for the crash harness hanging from the ceiling which was secured to his flack vest as without it, the pod's launch would probably have reduced him to a stain on the rear wall.
The pod rocketed forwards, shaking under the strain of being fired and under the impacts from the enemy defence turrets. A pipe burst, sraying white steam into the compartment and Phrass began to think they weren't going to make it, when they was another lurch, the harness saving him again, as the pod collided with it's target. As the pod came to a rest, the assult team tore off their harnesses and turned towards the airlock.
With the grinding of gears, the ramp lowered, and the emmissons from the burst pipe spilt out into the space beyond. The Sergant leading the team raised his first and thrust it forwards, signalling the attack. Taking a deep breath, Phrass charged forwards and:
A) was spun arround as a bolter shell impacted into his left thigh.
B) screamed as he let loose with his firearm.
C) tripped and rolled down the ramp, fortunately avoiding weapons fire from the defending crew.
or D) dashed straight for cover.