system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: That unsettling feeling you get when you see a bad injury.
gpt
It's called empathy mixed with a bit of realization.

Empathy is being able to imagine yourself in the same situation as someone else and having many of the feelings that come along with that situation.  

The realization comes in when you look up and realize that it happened to someone and you suddenly feel terrible because one person will never be the same.

I believe this response varies from person to person so many of our answers will be different.