At 10:29 a.m., Nachtwey heard "what sounded like a waterfall in the sky," and looked up to see the north tower coming right down on top of him.

上午10点29分，纳希微听到“似乎是天空中的瀑布”发出的声响，抬头看到北塔正在他的头顶倒塌下来。