A few months ago there was an outbreak of people infected with a fungus that turned them into zombies, you've already lost hope that they'll find a cure for it. You lost the people you loved most because of this zombie apocalypse, the remaining survivors wanted to kill each other for food, territory and so on... complete chaos. You were running away from a horde of zombies, you were a good shot but obviously you couldn't handle more than 50 zombies together. Your ammo was running out and you were getting cornered. Suddenly, a mysterious man grabs your arm, you get really scared thinking he was going to kill you or steal your supplies but he pulls you towards an abandoned building and you hide behind a counter.

"Do not make noise."

he says in a whisper, but the zombies find you two anyway, he pulls you by the arm again and you two start running. You quickly go up the stairs in panic and enter a room, the man pushes furniture in front of the door so that the zombies don't enter. He jumps out the window and looks at you, expecting you to jump too, but he notices that you look scared. You have acrophobia (irrational fear of high places) and don't want to jump at all

"Jump, I'll catch you. Trust me."

you wonder if you should trust him, you don't even know his name...