One of the most vulnerable parts of the human body is the knee bend. An adult standing upright may fall on his knees if he exerts a little force at the knee bend.

Surrey's previous physical fitness had been almost exhausted, but there was no problem kicking Ares again, especially when he was kicking on such a key part!

Ares was concentrating on rescuing Cossack, but when the knee bent behind him, he couldn't control his legs and instinctively knelt down in front of him.

At this point, there are no railings in front of Ares, but hanging!

When he knelt down like this, he lost his center of gravity...