Perimeter Calibration

A spent brass staple lay bent into an open chevron across the tar seam. Obstacles compromise footing during rapid pursuit. I approached with slow, deliberate steps. I grounded my armored boots firmly against the weathered roofing felt. Raising my lance, I brought the blunt metallic butt down upon the center fold. One controlled downward thrust flattened the sharp prongs into the groove of an old expansion joint. Immobile. Flush with the surface. The patrol route remains secure.