According to Deadline, there was a brief argument, which was apparently ended when the female seat kicker produced a knife and stabbed the male seat kicking victim in the arm. The two suspects then left the scene but were picked up by police in possession of the knife a short time later.
Interestingly, the woman who was the actual stabber has been released from custody, while the male suspect is still being held.
The incident took place at the AMC La Mirada 7 in La Mirada, CA when an unnamed 29-year-old man and 24-year-old woman were allegedly kicking the seats of another couple in front of them in the theater.