Sometimes The Cavalry just can't help because they're too concerned with avoiding being slaughtered themselves. If it looks like the heroes are having too easy a way out by calling in help, have the help run into problems of their own.
Even better if those problems becomes the heroes' problems after The Cavalry decides to take off.
[Reminder: Our guest commentators have not seen Rogue One. Part of the fun is seeing how their untainted impressions re-interpret the movie through the lens of our comic.]
Cassian: Let's get out of here.
Bria: What about blowing up the data centre?
Cassian: We can do both. Admiral Raddus, are you there?
Admiral Raddus: Cassian! We have the Peace Moon plans! What's your status?
Bria: We're fine but we need two ships down here right away.
Admiral Raddus: Two?
Bria: One for us and one for the tower.
Admiral Raddus: Wait... we're picking up something...
Admiral Raddus: HOLY TRAP!!
Admiral Raddus: It's the Peace Moon! Prepare hyperspace vectors! Reticulate splines!
Admiral Raddus: Cassian, Bria, you're on your own. Good luck.
Bria: Well, Radish sure left us in a pickle.