The explosion in the office Building

"I was in an office building I've never worked in, holding a coffee that kept spilling no matter how carefully I walked. The lights flickered, and I heard a low rumble, like a truck driving over the floor. Someone yelled to get out, but the elevators were all open and empty. I ran down the stairs, passing people walking slowly in the opposite direction. I remember thinking they must know something I didn't. Then the explosion happened. I didn't see fire at first, just a bright flash and a pressure that threw me against the wall. My ears were ringing, and the hallway filled with dust. I could see papers floating everywhere, but no sound. I found myself outside on the sidewalk, sitting beside someone whose face I couldn't make out. They asked if I was hurt. I said no, but my hands were shaking. Behind us, the building was still standing, except every window had blown inward. Then I woke up with my heart pounding, still hearing that low rumble."