I had a serious case of deja vu when I read this opinion, thinking: "Wait. I've already read this opinion before. But the caption doesn't say it's being amended or just published. What's the deal?"
But it turns out: I hadn't read the opinion before. It's totally new. I was just confused between this opinion and a different recent opinion by the Court of Appeal (which the California Supreme Court is currently reviewing) because they both involve a construction guy who fell through a skylight on a building on which he was working.
The lesson being: Don't go on the roof of a building with a skylight. Those things don't hold your weight.