Yeah well 1000% ok
This explanation should be shared to everytank who go in the raid content
This is wonderfully explained

I do forgive a tank who try and fail because he didn't grasp the right timing
I do not forgive and will be willing to neglect a LAZY tank who give out his work to other (aka the heal)

The only advice i will give from my point of view is :
Cherish your heal, because he is the one handling your butt
Be Nice and it will be patched, be harsh and you will get it cash...

...

In fact also sync old content is kind of a good way of train hard XD
Because there is no mistake allowed