Each of the pictures below is linked to much higher resolution
photos. Click each picture to see much greater detail.

The pilot is ready to go. The angle of the glider seems okay but there is reason
to think that it is too low:

This is the keel cradle:

Notice that the cradle is raised up. I flew off this cart numerous times. Every
time I had the launch crew adjust the keel cradle and bring it all the way down.
I never had the glider try to stick to the cart. The next photo:

The glider on the right side begins to rise. The pilot is still holding on to
the hoses.

The back of the glider is out of the keel cradle.

The glider may be completely out of the cart. It is turned to the left. The
right wheel may be turned slightly to the left. The pilot is no longer holding
onto the right hose. The glider may be in front of the base bar cradles. The
rear wheel is off the ground (bouncing?).

The base bar on the left has broken the back of the cradle lip. The pilot
appears to be reaching for the release. The right wheel is now 90 degrees to the
direction of travel (stopping the cart). The right corner of the base tube is on
the ground. The glider is pointing thirty degrees to the line of travel. The
wind is blowing sideways.

The pilot impacts the leading edge tube breaking it. The pilot suffers minor
injuries.

Please review the linked high resolution pictures and tell us what you think.

I'm thinking that the pilot got pulled out of the cart because first their keel
was
set too low and second they didn't hold on tight to the hoses.

Thanks to Oli Barthelmes for the photos.