Clever guy
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IIRC, he was messing with the kids and knew it was off because the lights were off. He proceeded to put his hands on it and convulse wildly as a joke.
He was messing with the kids when he grabbed the wires, not when he threw the stick.
Selling the bit is important too
I always saw it as being part of messing with the kids, he looks at the warning lights on top of the fence first. And for my headcannon at least, Grant is savvy enough to know that's no way to test if the fence is live or not, lol.