You're doing fine, Mark. Go back downstairs.
3 seconds sound clip from the The Big Heat (1953) movie soundboard.
You can hear this line at 01:16:52.484 in the Blu-ray version of the movie.
Quote context
[...]
- Okay, mac. Get 'em up high. Upstairs, mac, nice and easy now.
- Stop, Dave. Hold it, Mark. Come on, hold it.
- Nice going. This is my brother-in-law.
- You're doing fine, Mark. Go back downstairs.
- I guess civilian life hasn't slowed Mark down so much, huh?
- You kidding? It hasn't slowed him down at all.
[...]