Okay I am about done with tanking

[Duuude007]

I can't say for sure, but I have an inkling they're trying to tank both P5 and P6's Dreadnaught at the same time.

This is commonplace. I have MT'd both many times, even with 2 stacks on one all the while.

It just depends on how competent the healers are, of course. And being on the ball with cool-downs, good gear, etc.