Oh, he must've lost his nerve.
4 seconds sound clip from the Little Caesar (1931) movie soundboard.
You can hear this line at 00:29:10 in the Blu-ray version of the movie.
Quote context
[...]
- It's gonna be a tough break for a lot of birds.
- Oh, I forgot to wish you fellas a merry Christmas.
- Oh, he must've lost his nerve.
- Let's see the color of that money.
- Yeah? Well, I bossed this job and I'm gonna get my split in the regular way, or else...
- How'd you boss this job? By sitting here in your office cheating yourself at solitaire?
[...]