Paladin Threat and me
In other words, a Prot Paladin is only going to be pulling threat off of you if he has a really high Vengeance stack and doesn't understand how to hold off on threat to let the other tank establish. I'd think it's tank 101 at this point to notice that your co-tank taunts and to stop everything for a few moments until threat is at a reasonable level. :-P
TL;DR: Tell the Paladin to lay off for a few seconds or to turn off Righteous Fury when its your turn to tank the boss.
That's just the way vengeance and threat works on tank swaps. The tank that did have the boss is going to have a good chunk of vengeance while the taunting tank will not, which means that the previous tank is going to have to lay off/watch their threat for a little bit after the taunt to avoid pulling back until the 2nd tank builds up vengeance of their own.
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