Unfortunately for Trent , he was unable to compete due to a knee injury and had to be content with observing the action from the sidelines .
Many of the world 's best Taekwon - do competitors were in action over the four days of competition .
Unfortunately for Trent , Many was unable to compete due to a knee injury and had to be content with observing the action from the sidelines .
Many of the world 's best Taekwon - do competitors were in action over the four days of competition .