The friends run for their lives, but the zombies are relentless. They are picked off one by one, until only one friend remains. He is alone and scared, but he is determined to survive. He fights his way through the horde of zombies, using whatever he can find as a weapon.

The trailer ends with the friend standing on top of a hill, overlooking the zombie-infested wasteland. He is battered and bruised, but he is alive. He has survived Day 13, but he knows that the fight is far from over.

The trailer is well-made and suspenseful. It does a good job of building tension and creating a sense of dread. The acting is also good, and the zombies are believable.

Overall, the teaser trailer for DAY 13 is a promising one. It makes you want to see the movie to find out what happens next.

Here are some additional details that you can include in your pitch:

• The movie was made by a group of filmmakers on a shoestring budget.
• It was shot in the UK.
• The movie has been praised for its realistic gore and violence.

I hope this helps!