Reference Book: Star Wars Saga Edition Unknown Regions
See also: Feats
When making an Attack of Opportunity, you can stop an enemy in its tracks.
Effect: If you hit with an Attack of Opportunity, while wielding a weapon for which you possess the Weapon Focus Feat, against an enemy of up to one size larger than you, compare the same die roll against the target's Grab/Grapple check. If the die roll succeeds against the Grab/Grapple check, the target immediately halts all movement and falls Prone in its current square. The target can spend any remaining Actions normally.