First thing Jedi and sith learn is how to shield themselves from any kind of force attack. It becomes a subconscious defense that they always have up. It includes protecting their equipment (lightsaber) from being tampered with.
It can be overwhelmed and broken through by a superior force user, but typically requires an insane amount of power and can only be done by the most powerful of adversaries. Darth Bane was one of the most powerful sith of all time, but even he only managed to do it a handful of times.
It can be overwhelmed and broken through by a superior force user, but typically requires an insane amount of power and can only be done by the most powerful of adversaries. Darth Bane was one of the most powerful sith of all time, but even he only managed to do it a handful of times.