You pull you tank question.

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"new foe arrives" -> The issue is that a new foe didn't arrive. That's in regard to an enemy spawn up on a party, not you going out and seeking said enemy. That's not arriving by definition.

This is a 2+2=5 argument. Should I link you a dictionary page for what arrive means? What about "latecomers to a battle"? Where does this exclude enemies pulled by allies?

And if you followed what you were told, there wouldn't be a new aggro'd target to begin with.

This is a thread about tanks, not DPS. I asked you about the tank training, and you brought up DPS training. Tank players wouldn't even necessarily have done the DPS training anyway. So I ask again, where does the tank training tell you to ignore enemies hitting your allies? Please enlighten me.