Quote Originally Posted by jonkka View Post
Looked like half-hearted slap if you ask me. That's why I am so amazed that the tube did bend (as pics prove).
Don't forget, it's not just the impact speed of the car travelling at the tree, but the car was being flipped over at the same time so the force of rotation has to be taken into account as well.
If it was a straight side on, the roll cage may have escaped damage, but the site of impact was top of rear side window directly above the roll cage.