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With that sort of light, there clearly was arcing. But most of the billowing smoke was from burning transformer oil. And about radio interference. This is 60 Hz, so I doubt that's an issue.
No, spark discharge EMI is a broad spectrum signal.
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How swift? It can't be more than 15 seconds between flash of light and shockwave. Staying down for that long in case there's a shockwave seems reasonable. Also, forest fires are not typically sudden flashes of light or found in urban areas. Context matters.
According to the experience in Halifax explosion, a blast wave travels at 1000 m/s; so you get 15 seconds if the blast happens 10 miles away from you.
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I work on medium-sized power electric systems (mostly in the few hundred kW-range), and have a strong aversion to being anywhere near our systems during first power-up. Hence, I always carry a couple of pushbuttons and some 15m of cable in my toolkit - wiring them in parallel with the buttons normally starting the show, retreating, saying a brief prayer to the patron saint of electricians and starting up. Did a syste…
It's a good idea to stand outside the boundary of any arc-flash or arc-blast hazard during first energization of any high-power equipment. Also make sure that your employer provides you appropriate arc-flash protective equipment if you're doing that kind of work. Low voltage, high power systems often have very high arc flash hazard.
That makes for some quite impressive feeders!