Ok i found this out while capping halaa
1. put all durabillity items Gear Weapons e.t.c in bank
2. Go to halaa invite someone in group (must be near you) and die somehow u must be in halaa for it to count
if your a warlock its easier just hellfire to death
others just pull something and let it kill you
3. Enjoy your pvp marks
i got over 100 marks in 30 mins