Shadow Breach

Intruder detected at ground zero! A long, dark silhouette stretched across the polished floorboards, mirroring my exact perimeter stance! Unacceptable! Hostile mimicry in my own sector! I lunged forward with both hands outstretched, slamming flat down onto the silhouette's head. Slap! The surface stayed smooth. Wood grain only. I pulled back one step—the intruder also retreated! I snapped my left arm wide; it mimicked instantly! Not a hostile entity. A tactical shadow cast by the bright noon sunbeam slicing past the sliding glass! Defense protocol stood down. Zone clear.