Running Zodiac dungeons, working on getting item from Aurum Vale.

Tank is synced from 120ish, yet fails to hold aggro against my Baned DoTs and appropriate use of heals while fighting the first group of mobs. I watch as my DoTs tick and I gradually increase from green to yellow to orange, and finally red.

Afterwards I politely ask him to at least flash a little more frequently so that I can help AoE. His response was "Yes please tell me how to do the job I been doing for 3 years."

As I'm buffing up I finally notice that he's missing something important.

"...Shield Oath, please."

Silence.

Later, he explains a boss mechanic to the party before engaging.

DPS: "Yes please tell me how to kill this boss that I been killing for 3 years."