He was legit bleeding. The question is if the shot was planned to bust him open hardway or if Brock just potatoed him.
Also, in response to Cbear saying they would have had Brock take him down and GNP him, they did last night. As well as have Brock mention being UFC HW champ. They keep talking about him bringing legitimacy to WWE, so they are going to play up the MMA angle at least somewhat.