The low kick is the most dangerous attack in unarmed martial arts. A single well-placed kick to the knee or ankle can render the opponent unable to stand, and consequently unable to escape or defend against further attacks.
Low kicks are so effective that even seasoned martial artists have difficulty defending against them. Faced with such a challenge, some simply choose to ignore the threat, and concentrate on more glamorous hand techniques instead.
Denial is usually not an effective method of self-defense. However, Wing Chun teaches us how to use denial to our advantage, and thereby protect ourselves. According to Wing Chun principles, we should deny an attacker the position, the balance and the time to succeed with a low kicking attack.