They basicaly inform people about a 'bug' in game that they say it is not a bug, but part of the pvp system. warning people that even playing in green mode, there are ways to make you take skull (white, red or even black).
Ways they can make you take skull even staying in green mode:
- Druid: If a pk open on you, and you 'mas res' him, and he kills someone else, you are getting also the frag for those kills.
- If you soulfire (or others) someone with fake skull and he 'relogs', you are taking skull,, and frag if he suicide.