Cheek bones tightly squeezed, lips curved downward, brows furrowed, squinting eyes shifting side-to-side, hypervigilance exploding throughout the dining room. She and her cohorts are on the prowl – not for leaping lions, crouching copperheads, scurrilous scorpions. No! For walkers. The bi-podal choice – nay, necessity – we elderly in my Assisted Living Facility.