Abaddon's Mouth mission bugged

Is it just me or do some mobs do not attack you?

And I see the titan (boss at the end) and I snipe with my warrior-ranger's bow and I doesnt even move or attack me or party members

The mission worked fine one month ago when I did this mission on my elementalist... did new patches screw it up or something?

Why are you complaining?

It seems like you are getting a lot of free kills.