Ok so I'll tell you what worked for me. Stay in their leg area with a casual (great) shield with high fire protection. Then just fight one guy and hope the other guy doesn't destroy you. Usually summoning 1-2 npc summons works well here to take Agro. Try to get the guy with the laser attack, and wait him out occasionally hitting him once when he's open. If he jumps back run to him and if he starts to charge his beam get behind him and charge two heavies. After the second back off or block his follow up laser. The laser itself usually wont hit you but the aoe might. That's how I beat him anyways.