Characters are immune to abilities while using force powers.

@DaiJooky 
Since Anakin came out, several other Heroes/Villains gained immunity to Force Abilities effects (not damage) while they're using abilities of their own. These changes are coming in different patches and can be found in the according patch notes, but they all started after Anakin came with his own abilities immune to Force Powers. This includes Obi's All-Out Push, Maul's Choke Hold, Vader's Choke, and Grievous's Unrelenting Advance