Always assume an available absconsion avenue.
Because if you assume you can escape from any situation, no matter how dire, you won't be held back by worrying about how to get away, and you can concentrate on whatever other goal you have. Leave the worrying about getting away until after you've done the job.
And then there's no doubt you'll get away, because you're the heroes, right? The GM would never let you fail at that point of the adventure. Right?
[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.]
The good news, it's pretty obvious that they are taking two unrelated scenes and sticking them together. A pilot gets shot, and Bria is next to...
What is that thing supposed to be?
If it actually is a radio dish, that doesn't mean that there is any sort of audio-to-electrical equipment at the dish. The actual dish would just be the transmitter, and all the equipment for converting audio into electrical would be elsewhere.
There is a big giant dish of some kind as seen in the first panel. And it looks like Bria is trying to turn it with a very tiny little exposed...
First, what is that control panel supposed to be? That's not an easy to access area, yet it appears to have some important control circuitry and access panels. Like you are expected to put somebody up there, even though there is no way to get up there except by going into an area that you're not supposed be allowed into, and then go through this automated killer trapdoor, and...
Just the physics of this thing. The thing that Bria is trying to turn has such a short radius that the torque that she can produce compared to the mass of the giant machine...
Never mind the question of how a flying plane would be able to stop there to pick her up. You would need either something with hover capability, or an airship; a fighter plane could not hover or stop to pick her up. Maybe if you were a Jedi you would be able to just fling yourself off and somehow manage to control the landing without dying. Bria is not a Jedi.
GM: You see a hatch in the ceiling.
Bria: Maybe the trap door controls are through there. I open it.
GM: You emerge into the open air on top of Scarif Tower.
Bria: Oh! I'll take one of the ships to escape.
GM: It's a small catwalk area. There aren't any ships.
[SFX]: Pow Pow
GM: There's a control panel of some kind, and a giant radio dish above you.
[SFX]: Pow Pow Pow
GM: In the sky around you Imperial and Rebel fighters are engaged in battle.
Bria: Hmm. I'll hail a fighter to pick me up. Did you say there's a radio dish?
GM: Yes. You can use it to—
Bria: I know! I'll move it to reflect the sun into the eyes of a passing pilot, so he sees me here and picks me up.
Blue Leader: Argh! My eyes!