Brock came within an inch of getting KO'ed. Carwin completely gassed 4 minutes into the fight.
For Brock, he really needs to work on a lot of things. His conditioning and movement are good for a big man. He has a granite chin. His defense is lacking. He should at least have wrapped Carwin up when he was in trouble, buying himself recovery time. He had no answer at all but to turtle up. He couldn't take Carwin down in the first round and it seems he had no plan B. His guard was a joke. His hands didn't land at all while Carwin was teeing off. If he pulls the same performance against Cain who can actually last more then one round, he's in deep trouble.
Hopefully he develops a lot more skills the next couple of years. Hats off to Brock for the submission though. He could have easily smashed Carwin's face in once he had the mount but finished off the fight in style.
As for Carwin, his weakness has been exposed. All the guys will run for a round or two (if they can) to gas him. The fight was 5 rounds and he couldn't last 1. Reminds me of Mark Coleman when he started losing in the UFC years ago. People would survive the storm, watch him gas, and ko him.