Got a rules question that came up during our first game (which we didn't get to finish because of time reasons).
The empire put a leader on an interrogation order; it is used against a captured rebel leader. However, before he could play the mission, the captured leader was freed.
What happens if a leader is unable to do the mission card because it's invalid or doesn't have enough icons? Does it go back to the leader pool or can you do something else with it?