Yeah it was a pretty great shot until it went to the ground, I read a thread where the guy explained what happened (in his sad words lol) aparently his face was smashed into the ground by the shield, and somewhere around :03 seconds into the video he got punched in the face either on accident or intentionally. From what I have seen/read of Gavin, he doesn't seem like THAT type of person.
The video looksl ike he just walked off, but you can tell he was 'circling' around to make sure he was okay. The guy who got shield bashed couldn't have been in a worse stance when he got hit, his feet were really close together.