You can spin it any way you want, but the fact is, due to angular momentum the fuselage would have accelerated when the wing touched. The glider clearly did not cartwheel, it just touched a tip then the picture clearly shows that the tmpact was close to vertical .You must be blind if you can’t see the nose striking the ground at a near vertical position. Get your vision checked Your appeal to dubious authority of your so called experience is laughable.