Candice and Kristin Hermeler at the Family Shooting Centre in Denver, Colorado on November 15The CCTV footage is blurry, but sisters Candice and Kristin Hermeler seem cheerful as they walk together towards the shooting range.One wears a cosy-looking magenta jumper, while the other has a long grey coat. The smiles on their faces are clear. The 29-year-old twins, originally from Victoria in Australia, had signed up for a session at the popular Family Shooting Centre, just south of Denver in C