BTW, I used to work with voltages up to 4,800 VAC, (with one hand behind my back).
What Tesla understood and Edison (and many others) did not was at high frequencies, the current travels on the surface (skin effect) of a conductor be it a wire or a human appendage.
Building many Tesla coils in my life time able to generate X thousands of volts and sparks up to 10" (my best) I have had numerous occasions (planned and OH SH#@) to have experienced the skin effect.
If I had a conductor in my hand there was no problem but if not the HEAT from the spark hurt not the high voltage induced current.