Can't get help killing the dredge commissar
He walks to the back, then the front. Just wait for him to walk towards the back, run into the area and hide in the back. As he walks to the front, head towards the start of the jumping puzzle. You should be able to do it without aggroing him at all.
Regardless, the mobs reset when you reach the platform at the start of the jumping puzzle, so you should be able to just run straight for it. You could also just run right up there and logout, to force a reset.