I lived in CA for 30 years have been in quite a few earthquakes. Doesn’t add up that’s a 7.8 because this person Probably would not have been filming But holding on for dear life and/or panicking. Also depends on where the epicenter was and the type of building but a 7.8 is way bigger than the Loma Prieta was. Also it’s pretty long for an earthquake and yeah something happened after the flash of light. So something doesn’t add up. Don’t know what it is.