Thanks for sharing your story, and good advice. I like to carry a few items in my clothing so that I can be sure I have them on hand, even if I might not have a pack with me. Rather to my surprise over the years I have found myself several times indoors in places like shopping centers and the power has gone off, and the lights with it.
On each occasion I was able to bring my torch/flashlight out. This not only helped me see, but the light gave comfort to others around me and helped them not to panic and to regain their spacial awareness.
Bugs Bunny: "I speak softly, but I carry a big stick."
Yosemite Sam: "Oh yeah? Well I speak LOUD! and I carry a BIGGER stick! and I use it, too!" BAM!