Close Call - Dream

I was in a warehouse on the fifth floor of a large building. There were stacks of crates all over, and people working. I was waiting for someone (not sure who) and decided to go downstairs to wait since it was very warm in the warehouse. The elevator had just started heading down so I decided to take the stairs instead of waiting for it to return. I went outside, walked around in front of the building and then had the thought that perhaps the elevator was going down for the person I was meeting. Heading back I took the elevator up. When I stepped off there was blood spattered against the nearest crates and everyone on the floor was dead. I screamed and then woke up.