The man addressed the court, "I would ask you, as part of the sentencing, to grant me five minutes in a locked room with this demon. Would you do that?"
As the judge denied the man's request, he continued to ask, "Would you give me one minute?"
He then exclaimed and lunged across the courtroom before being tackled by bailiffs and removed from the courtroom.
The former sports doctor who admitted molesting some of the nation's top gymnasts for years was sentenced last week to 40 to 175 years in prison.
WATCH: Judge's full statement
Disgraced gymnastics doctor Larry Nassar is expected to hear from more victims who say he molested them when his third and final sentencing hearing resumes.
WATCH: Nassar's full statement
The proceedings are expected to extend into next week.
This time the focus is on abuse that happened at the elite Twistars gymnastics club in Michigan where Nassar offered treatments. The young athletes who confronted Nassar on Wednesday saved some of their harshest words for John Geddert, an Olympic coach who operated Twistars.
They said Geddert created an ultra-competitive atmosphere, was indifferent to injuries and rarely offered gymnasts any choice to see a different doctor.
Geddert has been suspended by USA Gymnastics, the sport's governing body, and has announced his retirement. He transferred ownership of the gym to his wife.
WATCH: Aly Raisman delivers victim impact statement at trial for Larry Nassar
The Associated Press contributed to this report.