Serra Turtling?

Why was he turtling so much? He was taking WAY less damage from his back...

 He turtled everytime his guard got passed.  If it weren't for the knees, which i don't think he was expecting, the turtle was probably a decent tactical move, because he was ducking his head and really couldn't take any legal shots to the head.

 ninja turtling


knees were perfect

 why wasnt renzo in his corner?