Its a fairly common problem when running with a pld seems they all forget to do any thing but halone and that starts to become a common problem when with any random pld ot i get it all the time in CT on the last boss.

Its odd that i never have the problem with a random War doing it but all ways random PLD guess its since they only need to use halone when tanking and forget about all other attacks apart form def cool downs.

The only thing you can do is ask them in a nice way to keep an eye on there hate but if you get the same kind of pld i get when tanking most of them will call you a noob or worse and only a few will hold back a little.