its the servers average PL
lets say everyone has 100,000 PL and you have 50,000.When you die your PL drops drastically to around the average which is 10,000.So killing a higher PL guy with a low PL can bring him down to the average PL.But most likely everyone hunts down the guy with the highest PL,so nevermind about it.You can gain PL by kiblobbing anyway