Investigators say during the physical altercation, Hannon stabbed McRedmond in the arm. McRedmond then went into the house for help, while several of the roommates and party guests detained Hannon until police arrived.
Police arrived to find the victim lying on the living room floor with a knife lodged in his forearm.
McRedmond was transported to Ventura County Medical Center for treatment. His injuries were not life threatening and he was listed in stable condition Thursday afternoon.
Hannon was also treated at VCMC for minor injuries he sustained during the fight. He was booked at the Ventura County jail for assault with a deadly weapon.