You know, I've always wondered who initiates the bump. I always assumed it was the fighters maybe because one time Buffer did it to a fighter he's close with but now it seems like every fighter does it. Sometimes it looks like they're trying to include themselves in the gang. Similar to when fighters give off that "I'm buddies with the boss" energy at the weigh ins with Dana.
Also, why does he get in the face of some fighters and scream their introduction to them? He's supposed to introduce them to the audience not to the fighter to get pumped by hearing their own name.