The only way you can hurt him is to kill him.
4 seconds sound clip from the Blade Runner (1982) movie soundboard.
You can hear this line at 00:14:00 in the Blu-ray version of the movie.
Quote context
[...]
- I had Holden go over and run Voight-Kampff tests on the new workers.
- Looks like he got himself one.
- So you look down and you see a tortoise. It's crawling towards you.
- That's Leon. Ammunition loader on intergalactic runs.
- He can lift 400-pound atomic loads all day and night.
- The only way you can hurt him is to kill him.
- I don't get it. What do they risk coming back to Earth for? That's unusual. Why?
- What do they want out of the Tyrell Corporation?
- Well, you tell me, pal. That's what you're here for.
[...]