That's the old rules on immobilisation. They now read:
Quote Originally Posted by Competition Regulations 2012
Immobilisation
Any robot that is unable to move or demonstrate control may be counted out by the judges. This may be due to mechanical failure, entanglement with the arena or arena hazards, such as the pit. When the judges
identify a robot that is classed as immobile, a 10 second countdown will begin. During this time should the
robot free themselves the countdown will be stopped. Robots unable to move after the countdown reaches
zero are knocked out and must not intentionally interfere in the fight. Robots in the pit at the end of the fight shall be deemed knocked out.