Yeah, I'd have to go with BA on that assesssment. It's strange and must have been scary. But glass is an imperfect substance. I learned this from a good many years of crafting stained glass. It has weak spots and little imperceptible differences in its surface strength and stability. The glass in that table had some miniscule break in its surface tension someplace and something, even just a slight shift of one table leg, an acorn falling from a tree, or even a couple of degrees of temperature change was all it needed to set off the fracture process.

We had the same thing happen to a glass panel in a balcony door one year as an evening chill was settling in. The temperature changed a couple of degrees, perhaps the house settled a tad, and zippity-crick, the panel was in a thousand little pieces all over a bedroom floor. The black plastic garbage bags we duct-taped up to cover the hole were ever-so-lovely, too.