There is a way not to even get hit during the entire battle with el Gladiator. To fight him in the beginning just charge him and get behind him like any AT-ST. Then, to crush the flying two-part gladiator, fly down to the maze and there is a little crevasse that you can hit him and you are sheltered from all his attack. It is just a tiny wall that protrudes from the bigger wall at about a 20 degree angle....it may take a few minutes to find. You will need to jet pack up just a little bit to hit him, but he will only shot his laser-which will only hit the wall- leaving you with a prime opportunity to punish him. Simply use your disrupters on the head piece and say hello to the skyhook battle.