It's more like no one actually saw fire, but the back half of the theater snuck out and ran away because there were rumors of a fire. Authers saw this happening and had a chance to tell the people in the front of the theater that the whole back half had thought there was a fire and ran away, but he decided to just slink out the back and leave the front half to get burned.
I'd be ashamed to call myself a journalist if that was how I behaved.