Chewbacca (EOD)

ASK FANTASY FLIGHT 

Q: If Chewbacca (EOD) with Old Ben's Spirit attached is dealt damage, and discards OBS, what happens?

A: Chewbacca can return the damage. The damage was dealt, otherwise there would have been no reason for the use of Old Ben's Spirit. Since Chewbacca is alive, you can return the damage dealt using Chewbacca's (EOD) reaction.