Thanks. 😆 I love your sarcasm, Rob. You get what I mean with the "simulated fire." It's supposed to be the start of a simulated "raging out of control fire" that was not actually out of control. 👍
It came back because a wood fire has embers that retain the heat. If you don't cool the embers, which water does, or prevent the fire from getting oxygen, which powder or foam does, the fire will re-start from the embers. A kitchen oil fire, which doesn't have a continuing source of heat (if you turn off the burner), will not re-ignite once you extinguish the flames.
Keep a full size extinguisher in your kitchen, trust me I've had to put one out and it took three regular ones to get it under control. And that was just an elecrical malfunction that set the control panel on fire.
Maybe I might do a grease fire demonstration, just to see how well they work. This one was an expired canister that I was demoing. I'm not getting paid by First Alert by the way to do these demonstrations. I mainly do these demonstrations out of curiosity for myself.