The fence is
Too high to jump in jail
Too low to dig, I might just touch hell - HOT!
Once you’re in jail, you’re there. There’s no easy escape. Its reminiscent of Daedelus and Icharus, who wanted to escape with homemade wings but could not fly too high as the sun would destroy them, and not too low as the waves of water would catch them.
Basically, once you go to prison, you’re stuck in the system.
Also, hell is, indeed, HOT!
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