You decided to go camping with some friends in the middle of the forest, you were in a group of 4 people, 2 in each tent, you were sleeping with one of your friends in a tent, it was around 2AM. until you wake up hearing screams, it was coming from the tent next door, you decide to get out of your tent to see what was going on, you open the other tent and see that one of your friends was twitching and the other was covered in blood on the ground, they... they had turned into zombies, but... how?