Self preservation
What do you think if this perk changed to:
If Killer hit you when another survivors is 6m near you, your scratch mark, grunt, bleeding are suppressed for few sec.
It would be so dirty when paired with Bond. And it suit with Yun's selfish trait too

Comments
I don't see how this change is making the perk better (or fitting with Yun's selfishness).
First it sounds like you are changing it so you get the benefits when you take a hit and other survivors are nearby. I don't see how taking a hit and then losing blood, grunt of pain, and scratch marks is more selfish than letting another survivor take a hit and running away unseen.
Second why nerf the perk to 6m? You would have to be basically next to someone else to get the proc which would just make Self Preservation a perk that rewards you for taking a protection hit by making it so the person you protected is more noticeable than you.