Am I Liable? Or Just Unreliable?

I've just walked out of the ocean with my son Ian, and I'm looking up the beach to where my other son Alex is sitting, wrapped in a towel eating a snack . . . and it's low tide, so Alex is a good hundred feet away from me . . . and then, without warning, sand fills the air over my son Alex's head and a micro-burst of wind, some rogue convection cell, crashes through our beach set-up and rips two umbrellas from the ground and whips MY umbrella high up into the air . . . and when I say high up, I mean really high-up . . . it flies over the life guard stand and it continues to go straight up until it's fifty feet in the air and for a moment it hovers and it's like Mary Poppins should be attached, but then it starts to plummet and people are holding their heads and ducking and screaming (Connell said it was like when a dragon swoops down and scares all the townsfolk) and it finally crashes into the ocean-- along with one of our beach towels which also got swept up in this miniature tornado, and they are both less than ten feet from where Ian and I are standing, and so we go retrieve them (but if the umbrella would have impaled someone, I think I would have walked the other way, because I don't want to get jailed for involuntary manslaughter because of shoddy umbrella installation . . . you don't garner much respect with the inmates for that crime) and our beach area was devastated, our belongings were scattered everywhere and Nicky was crying, unhurt but scared, but here is the strange part . . . the burst of wind did absolutely no damage to any of the surrounding beach equipment, just to our little area: weird.