“The deep subconscious of a Force-sensitive person is shielded by a protective barrier which prevents another Force wielder from penetrating his or her inner mind. This shield pushes violently back at an intruder, sending him or her stumbling back. This "shield" is an involuntary defense mechanism maintained by every Force sensitive person.It is one reliable way to determine which people might have the potential to become Jedi. The magnitude of the backlash generated by the shield depends on the character's strength in the Force. A person who is merely Force-sensitive will shove the intruder back by a meter. Someone with actual Force skills will produce a more intense reaction. Those with little training will send the intruder reeling back across the room. Someone who is well-trained, or who has a great deal of raw talent in the Force, might actually hurl an intruder across the room.
Source: Tales of the Jedi SourceBook
Credit to GreySentinel
^ Thanks man! I've been wondering this for while since Antoine Bandele's Kenobi and Skywalker VS Bane and Zannah.
So basically her success in using it is because she's dealing with people less powerful than her and she can't use it against people with more raw power?
Didn't Luke Skywalker get sent hurling back across a room by Kyp Durron?
‘Luke closed his eyes and sent a tendril of thought to the back of Kyp’s mind where the deep primal memories hid, leaving little room for conscious thought. Luke touched inward to the isolated nub in his subconscious thought. He pushed - and suddenly found himself hurled backward, tossed aside like a piece of fluff in a Bespin wind storm. He landed flat on his back on the other side of the room, gasping.’