He's fine.
1 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 01:22:55.688 in the Blu-ray version of the movie.
Quote context
[...]
- Yes!
- It's okay. I know CPR. I know CPR.
- Hey.
- You!
- Hey, did you just take his wallet? He just took that guy's wallet.
- Thank goodness. Great, Marty.
- As soon as I reload the fusion generator, I'll meet you on the roof of the high school gym.
[...]
