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If I were to pick any run, then I guess I might say Thornmatch(HM) solely because all I know about tanking there is that someone supposedly grabs the King and lures him to one side of the map while the other tank grabs the Marauder and Gladiator moogles and brings them to the far side - the issue being that I'm not quite sure if there's anything else I'm ever supposed to be doing there and it makes me a little nervous to approach it as a tank.
Nope, there isn't. About the only other thing a tank might want to do is stun/silence the BLM's Pom Flare if absolutely none of the other 4 DPS can do it, but that sort of scenario is exceptionally rare (basically, if your DPS are 4x BLM), and nowadays the BLM usually dies before it can cast it anyway.