I'm not sure what was going on with the ref. In the first round, after the slam it appears that Filho goes limp. You can hear Sonnen yelling "He's out, He's out." The ref doesn't even get in there to look.
In the second round, as you can see in the picture above, Sonnen was caught in the armbar and it was deep. Re-watch the fight if you recorded it. He lets out a yell, but he never "verbally submits."
I guess you could say the ref helped him, but he didn't say he gave up and he had a free hand to tap. I thought it was a poor decision and we'll hopefully get to see the rematch soon. In that rematch, Sonnen should keep it on the feet and just negate Filho's takedown attempts.
This fight also lets me know that the two people cornering Chonnen could (especially Dan) would demolish Filho.
Faber is just impressive. I CAN'T wait until they match up Yamamoto and him