The use of the term is described in article 19 of the competition rules administrated by the World Taekwondo Federation.
When a kye-shi is declared, the injured contestant is allowed one minute of medical first aid.
In case the injury was caused by a prohibited attack (Gam-jeon), the injured contestant is declared winner.
If the injury was not caused by a prohibited action, the injured contestant is declared loser.
If both contestants are injured and not able to continue, the scored points decide the outcome of the match.