HOW TERA ONLINE PK FLAG SYSTEM WORKS ?

Hi all experience TERA players, i would like to know how the PK Flagging color system works here

For example if u saw 2 person fighting at an area, you a priest if u heal this person will you get flag up(what color?)

Can't find anywhere on such pk flagging guide thanks.

I do hope they change PvP system from what it is in Korea. Ill look for the link I had on PvP.

So what are the color system ? I see Blue Green Orange Red what else i'm missing ?

Sorry for the late reply but here is a thread that explains PvP in Tera.

http://www.tera-online.com/forums/showthread.php?t=14078