This brave jiu-jitsu practitioner (who decided to remain nameless) showed speed and selflessness when he took action against a very determined child abductor at a restaurant in South Africa.
You can see his BJJ training come in to play when slaps on a RNC and takes his back with hooks in! He held him there for 41 secs. This is nothing short of heroic.
Another instance when a grappler stopped a kidnapping: