They are very fast and throw stones. They do not run in low health, but will try to maintain a distance from you. They can sometimes spam you with stones, hitting you 2 or 3 times before you can attack them. They can even attack you from off-screen.
Field Notes:
They are usually found in large groups with Kongra and Merlkin. When you approach Banuta from the west (Port Hope), they are the first apes you will encounter. They can Retarget.
Knights should be very careful around these. They can run faster than you can, and if you chase them, you will only be swarmed with more apes.
Paladins It's a good idea to hunt them with royal spears(depending on your level another distance weapon), but its more recomendable to use Enchanted Spears since its range its enough to kill a sibang without chasing and the royal spears have not enough range ,use a shield, which would greatly reduce the damage they do to you and can block the kongra's attack.
Druids and Sorcerers should use Ice Strike and Wand of Decay/Necrotic Rod or Hailstorm Rod. Ice Wave can also be effective as sibangs will still be close enough to hit. Do not chase them, or you will only be attacked by more apes. They can move items that are in their way. Take advantage of the buildings in Banuta, and try to trap them in corners.