Left 4 Dead: Gemini Strain.

Chapter XIX: Jingle Bells for an Unwelcomed Hell – Russell

A quick survey of the area outside gave Russell the biggest adrenaline surge he'd gotten yet. Walls had been erected out of plywood and barbed wire that stood nearly twelve feet high on each side of the building and stretched out halfway into the third lane of the six-lane main road. Three mounted guns sat spread apart equally in the shape of a triangle in the walled off area; the gun at point slightly back so that its sides were not exposed. He looked into the window to his left that faced the street and saw another mounted gun placed in it.
"That'll be our last defense if the first three fall." He thought to himself, "You, You, and Me!" He shouted loudly pointing at one woman and one man, "Let's go!"
With that he ran out the door catching most of the survivors by surprise, but a second later he heard bullets whizzing by his ears as they provided cover for the three. Russell reached his turret first, which was the one on the far left, and squeezed the trigger.
Now what happened next made Russell piss himself, a stick slid out of the barrel of the gun and a white flag unrolled with the word "BANG!" in bold black letters on it.
He vaguely noticed the yells of the other two as they fell victims to a similar fate.
The man's gun back fired, tearing his hand to shreds and the woman's just fell apart.
Russell, his pants darkened, fell to his knees as the infected washed over the bleeding man; absorbing his horrified screams. One zombie dived at Russell, its eyes glassed over and gray, right before its head exploded and the whirl of a Gatling gun rang in Russell's ears.
He watched as zombies fell before him almost like magic, then a grenade wet off a ways ahead of him snapping him back into his horrid reality.
"Dammit, Russ, MOVE!" Yelled Theo as he began to fire in bursts in order to keep the turret from overheating.
He had to run.
"The girl!" Russ picked up his two handguns from each side of him and shockingly dodged bullets over to the fallen woman.
Her arm had been torn out of socket and her lower jaw hung limply. Her eyes were wide as she stared up at him, he pulled back the hammer of his Colt 1911 handgun, she closed her eyes; he ended her life.