Facing potential death at the hands of a deranged knifeman storming their synagogue, hero worshippers somehow summoned the courage to hold him at bay. Led by rabbi Daniel Walker, they barricaded the door as Jihad al-Sharmie threatened them after ramming his car into others outside. Adrian Daulby, 53, and 66-year-old Melvin Cravitz died in Thursday’s attack during Yom Kippur, the holiest day in the Jewish calendar. Three others remain in hospital with serious injuries. Adrian and Melvin were