In a second I was on the ground and what was up once was now down. Faulty Velcro caused the a protective hanging mat to fall away from the wall and as it swooped down to the ground behind me my feet tripped under it and then gravity took over. The back of my head hit the now exposed wall bluntly and in the cavernous gymnasium the thud sounded like a cannon. It took mere seconds once I hit the ground to place myself again and that