[PGTips]

you would need to do

OnPlayerShootPlayer

which can be downloaded

Then check the side there on and check which side they killed

then if they killed a team mate you can kill them by setting health to 0

Edit
PS: if you'd like help with the code post your team varibles and stuff here no the system just the varibles you have to find a team

EDIT https://sampforum.blast.hk/showthread.php?tid=195439 this should help you