Especially at the corners, where the corner joints had opened up as much as two inches at the top.

This wouldn't be common at all. I saw that buckle on the east side of the roof -- 8 to 10 inches. That's the first time I've ever seen anything like that.

I thought, 'Oh, this is incredible, because that's where I was the previous day.' So, a lot of different thoughts went through my mind. I was grateful nobody got hurt.