Description given on Youtube:
Complete on-line version: http://youtu.be/HBEUYs6I6vU
A severe kickback is the most dangerous hazard of all for a chainsaw operator. The incident occurs in a fraction of a second and can cause injuries ranging from cuts and scrapes to amputations and death. This compelling 13-minute video opens with a re-creation of a fatal kickback incident. It then reviews important information every chainsaw operator needs to know about kickback, including how and why it happens and how to prevent it.
http://www.healthandsafetyontario.ca/wsn