In the Jet Set Go event, I killed one enemy, Main Event Hulk (enemy) was airborne, and enemy Nova was visible and a valid target for other abilities.
However, Gwenpoole’s “Chekov’s Gun” wouldn’t fire, saying there were no valid targets. As soon as ME Hulk landed, I could fire the ability, and one shot hit Nova.
Nova was a valid target the entire time. It should have been able to fire the ability even if ME Hulk wasn’t targettable.