The instant James started to do anything that would make a paradox, the space-time forces snapped him forward and ripped him to bits.
12 seconds sound clip from the X Minus 1 - A Gun for Dinosaur by L. Sprague de Camp classic radio drama series.
You can hear this line at 00:27:15 in the radio play.
Quote context
[...]
- Ghastly mess. Looks as if every bone was pulverized and every blood vessel burst. I dare say.
- But that's his gun all right. It's James... there's no doubt of it.
- You can't have paradoxes, you know... just isn't done.
- And, you see, I'm a lot more careful now.
- I shouldn't have taken James when I knew what a spoiled, unstable sort he was.
[...]