The ones I'm talking about don't run off the edge. It happens when they are already walking in the edge's direction. It seems more like it distracts them, rather than scares them. It doesn't just happen with Abe. You can use a possessed Slig to do the same thing, and in the the secret area I mentioned, the sounds of the top Slig beating the Mudokons will also make the bottom Slig walk off the edge.
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