Because it’s meant to be a barrier, it’s meant to be hard to cross and attempting to do so should end up with the person tangled up in it. If it’s loose and jumbled in loops it’s harder to keep steady and cross. If it was laid flush with the ground or the top of a wall, all you’d need would be a moderately thick blanket or rubber mat laid on top of it and then you’d cross with no problem. You can still do that in looped wire but it’s much harder because it moves and rolls as you put weight on it and throws you off.
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