In December 2017, a fireworks technician was working at a fireworks display, which included both ground and aerial fireworks.
About 10 minutes into the display, the technician manually lit a 29 mm 52-shot fan-type ground firework. This type of firework pr duces a V-shaped fan effect when initiated. The shot tubes at each end of this specific fan firework were angled so that the fireworks were expelled at a trajectory with a particularly low angle to the ground.
After lighting the fan firework, the technician retreated backwards. Feeling that she was too close to an area where aerial fireworks were being initiated behind her, she stepped away, inadvertently moving into the line-of-fire of the fan firework, and was struck in the face by an unidentified projectile, receiving facial injuries.