I successfully tame him early Monday morning. The way to do it is to slowly take her health down (don't equip any melee weapons). And when she called for her mate, back your damage off even more and he should appear. I also kept her near the rock where you summon her at. After he appears, quickly kill her, freeze him and  you should have no problem taming him. It really tested my patients trying to get him to spawn, but it was totally worth it once I tamed him. He has made a great pet.