Let the record show that Arthur has done absolutely nothing wrong since waking up from his extremely preventable death!

He lowers his hand quickly, guard up again, the brief and illogical feeling that he wants to hide his vulnerable spot from her passing over him.

Arthur doesn't add to the conversation -- there isn't much he could add: Cassandra's the one who kept the chip, the one who has the means to give Crichton some closure, and the one Crichton actually wants to speak to -- but instead backs up a step, and seeks out the wardrobe door again, pushing it closed and re-orienting himself at the same time. And now it finally occurs to him to wonder what, other than Harvey, Crichton himself woke up without.