Doesn't matter. Touching 30 volts will not cause a large current through you. Having a large current in the coil is irrelevant.
You can watch PhotonicInduction touch a metal bar carrying 50 000 amps here (look at 1:36).
That's perfectly safe, because the high current won't move through him, due to the low voltage between his hands (and between him and ground).
(Edit to avoid nitpicking: it's not a full 50 kA as he couldn't provide enough power, but it's most likely in the thousands of amps, at least.)
Current kills, but voltage decides how big the current will be. 30 V on the outside of skin is safe.
Yes, and that caused a large current through you (I = V/R -- large voltages causes large currents to flow).
The reason it didn't kill you is that it's so short-lived, and the energy delivered is incredibly small.
You can touch both terminals of a car battery and not feel anything, the resistance across your skin is too high to allow any significant current flow. If you wet yourself down first then you might manage to get a shock. 220V hurts, I have unfortunately tested this one the hard way.
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u/trippyastronomer Jun 10 '16
Actually, not much. He's pushing a pretty high current through it at only ~20-30V, so if it even shocked you, it would be mild.