That's, uh, Breck Coleman. He very quick with his knife.
6 seconds sound clip from the The Big Trail (1930) movie soundboard.
You can hear this line at 00:15:46 in the Blu-ray version of the movie.
Quote context
[...]
- He was hacked up and stuck full of arrows. Looked like Injun work, all right.
- If ever I find them hellhounds, I'll sure make 'em hunt their holes.
- Come on.
- Who's that young buck over there with no hair on his face?
- That's, uh, Breck Coleman. He very quick with his knife.
- He come from the plains, the mountains. He live with the Indians.
- He can throw a knife through the heart in 20 feet. He's the best shot in all this country.
- He'll know too much for his own good someday.
[...]