How do you know his arm was going to snap? It's very possible he could've slammed Amir again.
If this was anyone but CB I think people would be acting differently and tat's something that bothers me. CB didn't do a real tap one tap and then moving your arm to defend yourself shouldn't be enough to stop the fight.
The main point is that he did one tap, intentional or not, and Herb dean was close enough to stop it right away.
Why are you saying he didn't tap? Because he said so? You can clearly see one solid tap. How is Herb dean supposed to know that he didn't mean it or that he accidentally did a tap-like motion? He couldn't possible. Plus, that Arm Bar looked pretty deep to me, plus he'd already tried to pull out of it for a few seconds.
I'm tired of people blaming the ref because the fighter that lost wants to complain.
Do you honestly think that Herb Dean should have just ignored that single tap, just to see if he really meant it? What would your take on it have been had Herb ignored the single tap and then Amir broke his arm? You would be calling for his head for a late stoppage.
This is getting ridiculous.