I would guess that the crew inside the tank were in contact with metal that was connected to the tank chassis in some way so the current would have passed through them?
Don't the tires of a car have something to do with people being safe in them, and aren't you toast if you touch any part of the car chassis?
EDIT: Oh and I think you could argue that RPG's and rocket launchers were innovative "untypical" anti-tank solutions at the time as they started essentially as huge anti-tank grenades with small rockets attached to give the "thrower" (as they were originally thrown or placed) a little more range. The PIAT is also interesting. An AT grenade launcher powered by a spring.
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