Wait a minute. You can't shoot 'em down in cold blood.
4 seconds sound clip from the Dark Command (1940) movie soundboard.
You can hear this line at 00:59:24 in the Blu-ray version of the movie.
Quote context
[...]
- If they're not warned they'll be ambushed and wiped out.
- I'm goin' with you. I've been wantin' to join anyway. I'll get the horses.
- Wait a minute. You can't shoot 'em down in cold blood.
- You say it's Cantrell. You've been sayin' it for weeks.
- Why, you had half the town wasting time searching, and still nothing's been done!
[...]