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I'd bet one in fifty could climb that fence with a rope and grappling hook.
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I'm going with this. Most people are not fit enough or have the skills to climb a fence that tall, grappling hook or no grappling hook.
Hell, most people wouldn't cross that fence with an extension ladder. Do YOU wanna jump down from that height?
That height is sufficient that jumping from it probably has a 30 percent chance of a fatal outcome and a 1 percent chance of walking away with zero injuries.