The 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 Colorado.