EricH wroteThat does not matter. The rule does not differentiate between a runner or a retired runner except to determine which runner ends up being called out. The rule states "the runner is out...when the runner interferes...." There is not a separate rule for retired runners. Only the EFFECT is different because you can't call a retired runner out.
Well, I don't have the rule book in front of me since I'm on travel right now. But I'm pretty sure there is a separate rule that deals with retired runners. It says something like, "When after being put out or after scoring, a player interferes with the defense's opportunity to make a play on another runner." It is a little more open-ended to interpretation on what that retired runner does, regardless of intent.