Actually, in my example, the fill rod probably touched the tungsten or close enough. I have filled bare handed without incident. I have laid my bare arm on the bench and gotten tickled before. But as I said, much ado about nothing. It always happens when you first start the puddle and generally that's not much juice so the smart thing to do is to stop and fix the problem, ie appropriate good grounding and clothing. Bad grounding is usually the culprit and the welder him or herself completes the circuit.
You want scary, forgive me Lord, shock?, turn on a dual coil msd 8 while holding on to two of the tester plugs for 5 seconds. Now, that will get your attention. I survived that but do not wish to repeat it.
Ever hear of anyone being electrocuted by the tig process? I haven't and you would think in this internet age of rampant inaccurate stories and conspiracy theories you would think there would be one on at least one on the welding forums.
I would think that if you held the ground in your bare hand and had a bare toe against your steel toed shoe and struck on arc on that steel you might be able to complete a killing circuit. Suicide or stupicide by tig I'm not sure which.
If you haven't gotten zapped by your mig yet you are not likely to be tickled by anything else...or.. you are not using it enough.
Bottom line is still the same, Electricity is being utilized and all the appropriate precautions and procedures must be adhered to. How's that for a caveat?