What about introducing some kind of deadly thorny plant, (like a spiky tumbleweed-cactus thingamajig) that grows on cliff faces throughout Scrabania?
It could be placed below the long gaps, growing out of the cliff face, so if Abe jumps and doesn't make the gap be falls onto/through the thorns and dies? There would clearly be no way to hang from the ledge because of the thorns.
A dry dusty plant like this would fit with the hostile desert theme quite well I think!
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