New Year with a bang

OOPS: Firefighters were responding to a West Hills address for a medical emergency Thursday. Sirens have a way of startling people who are breaking the law, in this case a Resedan. Via the LAFD News & Information blog:

According to the man's later statements, he had been handling a variety of fireworks, including some possibly modified devices, when they inadvertently discharged. He stated this happened when he was startled by the ambulance siren, which he believed may have been police officers coming for him.
Firefighters offered emotional support to the man while cleaning and dressing his wounds, which included an avulsion of the left thumb and small finger as well as significant tissue damage to that hand.

What's an avulsion? ::: Ed. note--- Ow! :::