To be honest this fight's main objective is NOT just killing the "boss", but to burst it when it is moderately close to the tower with the roller cube object so it falls down, then you kill the "boss" and use the roller box to break another Tower's support beam and create the pathway for you to get to next area. Killing the "boss" without bursting it while close to the Roller box tower to destroy it means you will have to redo the Ironclad boss fight... Which was what happened to me the first time!!