I agree, people can PK anywhere, angel clan, or anywhere. But I do think the system should give the kill to the person who hit last if they suicide after. On other servers they fix this:
like era, you can't run into a NON PK building and eat, they allow players to keep killing you in NON PK area's if they were previously killing each other.
It is annoying and discouraging to be killing somebody for 30 seconds just so they can run away into a baddy at .5... It's annoying because you should be awarded that kill for hitting them last.