Any other tips you can post would be appreciated.
A big thing is to understand human nature. When something catastrophic happens, most people’s brains try to rationalize that everything is normal (it’s called normalcy bias). I’ve done this myself. I once felt an earthquake (6.5 on the Richter scale, epicenter was about 150 miles away so there was no damage in my locale). My brain tried to grasp on anything but an earthquake or something else bad. I was in an empty classroom but turned around thinking somebody was kicking my chair. Then I thought it must be a truck outside because I was in the corner of the building even though I heard no engine. In the Santa Barbara mass-shooting, people thought it was another active-shooter drill and went about their business.
The most important thing in a disaster is to move. GET OFF THE X. Movement saves lives, those who don’t are the ones who are going to be killed. Secondly, arm yourself. A metal pen is a good stabbing weapon or find a blunt object with some weight. A tactical pen is a very good thing to carry.