I have some Ideas i was thinking off whilst playing Abe's Exoddus again.
When Abe is in the shadows and waiting for a Slig to walk past, He could step back into the wall, flat him self out and let the Slig walk past whist looking at the Slig's movement. A bit like Metal Gear Solid
Another idea was whispering. whilst there is a sleeping Slog or Slig, you could whisper to a fellow Mudokon to follow you then sneek off. The Whispering could be automatic when a Sleeping enemy is near.