Add on what happens next in the story, introduce new characters, or whatever. Just please try to not make characters die out of nowhere, have super powers, turn into monkeys, etc. unless it has to happen in the story.
This is a month into a class 3-4 infection. (Fresher zombies can run)
Start: Sam Griggs looked down the scope of the rifle from the second story window of the gas station.
"I see 4 of them," He said over to Jason who was looking through a pair of binoculars.
"I only see 3," Jason replied.
"One trapped in the silver Toyota."
"Ha, I see it, look at the bastard squirm."
"We gonna go or not?" Scott asked from the back of the room.
"Yeah, Sam give us cover." Jason said as he walked towards the door pulling the hood over his head and tightening the bandana around his mouth. Scott did the same and they drew their silenced USP pistols and silently got out of the building. They quietly snuck across the street and hid behind a minivan in the parking lot of the grocery store.
"Get inside and get all the food you can in that grocery cart, then we rush it back to the Humvee." Jason whispered. Scott nodded and peeked around the corner. He saw the three infected and they all looked pretty old.
"I'm pretty sure these are shamblers." Scott said.
"They better be, I don't need any more of these things chasing full speed after me."
"Heh, yeah. Make a break for it on your signal, man."