An arced low voltage circuit is easily hot enough to burn carpeting, clothes, skin, etc.
How does one achieve such high amperage with 30,000 volts? Resistance (ohms) must have been extremely low. Weird.
There has to be a source of the current.
The current available is only that stored in the capacitance of the insulated body to the environment around it. Very little capacitance, or ability to store enough energy to burn the carpet.