Thunder on the Steel Shutter

A massive corrugated steel shutter was sealed dead shut against the dock wall, standing in stubborn silence! Completely intolerable! I dashed straight along the concrete ramp, launched into a furious mid-air backflip, and drove both heels clean into the hollow metal panel! BOOM! A deafening acoustic shockwave rumbled down the loading bay like rolling thunder! The rusty steel slats rattled violently in their vertical guides, shaking loose clouds of dried grime and flaking paint straight onto the asphalt. That frozen gate knows who owns this night!