By Saif Hameed BAGHDAD (Reuters) - Muhammed Hilal and about 100 other members of Iraq's Albu Nimr tribe felt safe Hiding from Islamic State militants in tall grass -- until the headlights of dozens of cars exposed them. "We k**w you are there, traitors," militants shouted, before opening fire on the tribesmen who had fought them for weeks. Most died. Some were taken prisoner. Shot in the arm and leg, Hilal survived, after smothering himself in blood and playing dead under corpses as the militants beat the wounded and called them "scum", he said. ...