Three months after his release from Hamas captivity, Omer Shem Tov stood on the pitcher's mound at a Boston Red Sox game. The moment was emblematic of the new-found — and for Shem Tov, unsought and at times unsettling — celebrity the 22-year-old has found since his release from 505 days of captivity in the Gaza Strip. Before being taken hostage, Shem Tov had just finished military service, was working in a restaurant, having fun with friends and planning an overseas trip.