Well, he sure didn't fall off on purpose. And no, it was the roof. They're tearing apart the roof across the street.
Also, what the heck do you mean, "you don't fall from a roof by accident"? What are you talking about? I'm so bewildered by that statement. People fall off roofs all the time.
Note: I'm not being sassy, I'm genuinely confused as to what you mean.