Both assasins and sorc's get absorb bubbles. I think the assasin's activate on charge or jump whatever they get. I know I drop like a pile of rocks to any class that does any burst damage.
Which the trooper and the smuggler both do. Against a Sith Maurader or Juggernaught you still have the problem if they are managing their companion as Vette and Lt. Pierce can both do burst damage as well.