Guild Wars 2

I am getting very frustrated with monster invulnerability.i fight one then its suddenly stops,regens and walks away only to attack me after he is full health again and me not.I am not pulling it out of its range so there is no way in hell he is out of his agro zone,wich is still stupid idea to make then invulnerable in the first place.

I get this alot more underwater than on land. Mainly sharks it seems. And like you its not like im attacking and running away to fight. I run up to it to fight with it usualy not having to travel at all to get to me.

I have noticed that while it is invulnerable to me, another player can come along and fight it while all my attacks keep saying invulnerable.