In Return of the Jedi, Luke and Darth Vader both sense each others presence on the moon. In The Force Awakens, Kylo Ren
senses Han Solo on the Starkiller Base
Is it possible to sneak up on a powerful force user? Or do you have to be
related to them
or significant to them in some way to be detected? Are there any examples of a force user NOT sensing someone (in canon), or any successful attempt at disguising someone from a force user?
To clarify, I am talking about physical presence, not force ability.
Han Solo doesn't have the force, but Kylo sensed him anyways