This doesn't work. Nothing drops when you kill the orge again in the Wolfship Turbine. The Mindbender is a heroic adventure and it's not running this week. You can't get the same piece twice with the same character.
You can pick up the Fragments from Petra, then complete them and get them back from the location where you would normally get them. E.g. you complete a fragment, then you go to the Tangled Shore, kill the Ogre in the Mindbender's Ship and you get another fragment you can do.