Scenario: I have The Red Viper (Immune to Events) in play, and play another Lord.
My opponent plays A House Divided (Response: After a player plays a character with a Trait he already has in play, choose and return 1 character with that Trait to the top of its owner's deck.)
My Red Viper is immune to events, so can A House Divided recognize that TRV is in play? I say no, because his immunity is broader than just "immune to being targeted by events" - his immunity should protect him from events recognizing his existence.
My opponent says no, his immunity doesn't extend that far.