It was the right call. If you cannot defend yourself then it's over. Safety is the number one thing. I know you all wanted to see a beating, but it's not just about what you want it's about safety as well so you can keep the UFC the way it is.
If you watch this tape again you will see he didn't defend himself even after the first elbow. After that, it looked like his eyes were shut for a bit and looked like bed time to me. It was a good stoppage and rightfully so with how much animosity towards each other. I'm sure that put them on high alert early.