You still have to be careful because the HKs use infrared.
6 seconds sound clip from the The Terminator movie soundboard.
You can hear this line at 01:09:09 in the Blu-ray version of the movie.
Quote context
[...]
- Get some sleep. It will be light soon.
- OK.
- Tell me about where you're from.
- All right. You stay down by day, but at night you can move around.
- You still have to be careful because the HKs use infrared.
- But they're not too bright. John taught us ways to dust them.
- That's when the infiltrators started to appear. The Terminators were the newest... The worst.
- Traversing your sector in search mode. 750 meters north of your position.
- Roger, Yankee-1-7. You are clear to return.
[...]