The guards

Weather permitting, I walk past Buckingham Palace on my way home from work every day. I was hoping to catch the guards on their 'patrol' phase where they march up and down the front of the building, in complete symmetry with each other, in an outstretched legs manner that could only look normal in the ministry of silly walks. I often wonder what would happen if there was a crisis. I suspect they would run back and forth, hands waving in the air shouting 'WhatDoIDo WhatDoIDo WhatDoIDo '