The championship-winning coach discussed the small margin for error when trying to be elite in your chosen field

Patriots training camp got a surprise assist from the hardwood this week with Celtics coach Joe Mazzulla dropping by.

It was Celtics coach Joe Mazzulla, who stopped by to spend some time on the sidelines. Mazzulla has been a guest at previous Patriots practices under Bill Belichick and Jerod Mayo. He grew up a Patriots fan in nearby Johnston, RI and enjoys learning from other coaches.