In English mean swinging back elbow alternately

This trick is used when the opponent attacks from behind. Throw back the elbows while the other one swing back to the opponent's face and the either one swings back to the opponent’s abdomen in alternate actions by quick speeds. This trick is used when you lose balance or throws the punch to the opponent and misses the target.

To protect
Step very close to the opponent all the time.

To counter
Insert the arm under the opponent's armpits and bend the opponent's neck down aside by pressing the inner wrist then throws up the knee to the opponent's chin or face.