Last Sirensong Sea that I tanked, one of the dps spontaneously decided to pull the back half of that prison area after the second boss. Nothing said before hand, and I'm a bit of a doormat so I said nothing, just started keeping a closer eye on my cooldowns. The healer kept up like a champ, and no drama was had.

They could have spoken up, but for all I knew they were friends with the healer in a voice chat or something.

At least they didnt harp on me.