Celtics coach Joe Mazzulla stopped by Patriots practice Wednesday. Here's what Mike Vrabel said about the visit.

Mike Vrabel is unique in that way. He puts on a pad and engages with the linemen. He also enjoys trash-talking with the players. Williams, who signed a $104 million free agent deal, is enjoying all that Vrabel brings to the table as a head coach.

Mike Vrabel doesn't want to see his Patriots players fight in training camp -- even though he fought in his very first padded practice as a player nearly 30 years ago.