Since he was standing less than 5km away from the guy, Kimbo suspects low voltage (due to the fact it was dead straight and dissipated right after it went through the guy’s body) but high amperage. An approximate 28 to 30 thousand kelvin tends to be measured from a strike and the air surrounding atmosphere.
In other words hotter than the surface of the sun.
Good job Doom. Holy mother of the gods that’s crazy.