(CNN) -- Former Olympic champion Angel Matos of Cuba faces a life ban after kicking a referee flush in the face during his taekwondo bronze ... when he fell to the mat after being hit by his ...

And a Cuban competitor kicked a referee in the head over an unfavorable call. Since taekwondo made its debut ... when he fell to the mat after being hit by his opponent, Kazakh Arman Chilmanov.

Each Olympic taekwondo match consists of three rounds, with each round lasting two minutes. There is a one-minute break in between each round. At the start of a contest, the competitors stand at ...