Quote Originally Posted by Rambus View Post
This does need some fixing, i seen mobs go yellow after one person dies and people try to steal it
The mob goes yellow if the person to last take an action on it is killed, warped out of the zone, or disengages.

As for wanting nobody outside of your own alliance to be able to get hate on the mob, this is what /blockaid on is for, although this has already been pointed out.

If you can't keep a mob claimed and it is an ongoing issue for you, maybe you should revise your strategy for the fight.