Villainx makes an interesting point. Personally I've only been attacked once while fighting in this area. But if people cant even complete the boss fight and claim any rewards, that is defeating the point of the area.
So you should be shielded during fighting the boss and while you standing near the boss. Then you can leave it be a pvp area . If you get shielded while say your near the boss or in that area the boss walks around that should be fine
then you can only be attacked when you port in or you lose