According to the description accompanying this video, a pair of thieves on a motor scooter snatched a purse from a woman in Wenzhou, China. The guy on the bike calmly dismounts and hurls the bike at the would be thieves, causing them to crash.
David Mobley apparently created this one hour self-defense video for the community access cable TV channel in Missoula, Montana. He purports to demonstrate self defense techniques you can use while riding your bicycle. Now he sells his “Bicycle Combat Tactics” video on Amazon.com.