Static discharge has a high amperage as well, but it lasts nanoseconds, plasma globes and tesla coils are way too high of a frequency to disrupt heartbeat. people want a simple thing, but electricity is not simple.

lethality of electricity means some amount of energy was dumped in a certain time-range, in a form that is disruptive to muscle function. any of that missing, and you’re either fine, or cooked from the inside depending on the current.