They're gonna burn the engine and steer it manually attempting to keep the Earth in the window.
7 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 01:40:53 in the Blu-ray version of the movie.
Quote context
[...]
- Look, it will ignite, will it not?
- I just want you to know the engine's never been tried like this. That's all I'm trying to tell you.
- I know what you're trying to do. I guarantee I won't hold you personally responsible.
- If it lights, it lights. Let Lovell do the rest.
- Okay.
- They're gonna burn the engine and steer it manually attempting to keep the Earth in the window.
- Okay, this is gonna take all three of us.
- Freddo, you handle the pitch.
- I'll do the same on mine with everything else.
[...]