Thanks for the description of arc-flash.
I was once told a story of a guy who was doing some work on his car, and failed to remove the negative battery terminal first (for negative ground vehicles). While removing the positive terminal, his finger complete with gold wedding band got between the wrench and the frame of the car, thus causing a hefty are-weld to the ring, and permanently damaging the nerves in the finger. Ouch!
As you said, it's not just voltage!
Automobile batteries sold in the US state "High Voltage", when it is actually high current that is the danger, but most auto mechanics and owners wouldn't understand what "high current" means.
I have never had the experience of seeing an arc up close, but have seen them on utility poles during wind or rain storms.
I'd like to keep my experiences at a distance.