A shopkeeper with a 1st Dan Black Belt in Seibukan karate disarmed a robber, tackled him, and held him in a leg lock. Unfortunately for the criminal, police arrived 13 minutes later. In a leg lock, that can feel like an eternity! The tackle was aided by another shop clerk, and there is a video. It's messy, but that's reality: Dramatic moment black belt karate shopkeeper in Leicester tackles raider armed with fake gun.

Here is a youtube video with some basic training from Seibukan karate, which looks like a branch of Shorin-ryu (corrections welcome):