As a tank you decide what is being pulled, If someone pulls something let em die(If they do it on purpose) If its your first time, They shouldn't speed run simple as that.

I had a new tank yesterday in a lv 50 dungeon, For fun i said, Pull it all matey Arrr! And he was a fun guy and surely he did. Pulled everything, We didn't wipe we had fun. So it all comes down to the tank. If you are comfortable with it, Do it, if not give it some more time, But in all honesty, Aim to speed run though. People like those tanks, If we can speed through it, Speed through it.