Trust me, the radiant heat alone won't allow one to get anywhere near that fire, to have an effect with any kind of fire extinguisher.
In my full proximity suit (silvers), I'm protected to ~500 degrees F, and I'm feeling heat from many yards away from the ~1000 degree F+ Jet A fire thats raging, before I'm even close enough for a 1.5 inch handline stream to effectively reach the flames. Hence why CFR firefighting for initial knockdown, is done from the cab of the truck, with the firefighters inside the cab in full proximity gear and the cab protected by sprinkling systems.
Hell, even the wildland controlled burn we had last week was burning hot enough in places where it was unapproachable in wildland gear to do controlling with water lines on it. Someone in street clothes isn't going to stand a chance of doing much near the fire area unfortunately.
There are times to drop the camera and try and help indeed. Unfortunately, a situation like this is one where there isn't much even a trained person can do, without the right equipment at hand.