User blog comment:BellatrixTheMagicalPotato/Why Voldemort Would Easily Kill Vader/@comment-4840996-20150603093720/@comment-24367396-20150608145831

1) There is an ability to block out people from sensing you through the force which can be gained through extreme meditation. If Vader uses this then Voldy cannot see what he thinks

2) Vader can use the force to sense what is what

3) Destroying the hilt of the lightsaber would not destroy it