Fans are not allowed on the playing court. If there was an altercation, the South Carolina security/event staff is to blame for not surrounding the court to keep these fans from rushing the court. Sure, 2,000 people rushing the court is hard to stop, but you have the #1 team in the country coming into your gym, surely you hire extra staff.
Also, it is blatantly obvious that the UK player in that video is Patterson.