As soon as Siver was dropped Herb was hovering over them like he was going to stop it if McGregor threw any punches at all. Conversely we see UFC cash cows like Brock take nasty beatings where there face is profusely bleeding for like 4 minutes, but Siver basically took like 1 clean elbow from mount and it was stopped. I used to like to think that the refs were unbiased and tried to be objective about the fights, but I don't think so anymore. Had it been McGregor on the other side of things, I think Herb would have let that round finish. Oh well. I'm not a McGregor hater or a fan (and neither of those of Aldo either), just an observation.