Moshe Kaitz is an Israeli Gracie Jiu-Jitsu black belt under Royler Gracie. He is a los an MMA fighter who has beaten UFC vet Hermes Franca. Like every Israeli, he spent a minimum of 3 years in the army in a conflict zone.
Check out this highlight he made showing Gracie Jiu-Jitsu. You can be sure that Moshe had real life experience using these techniques in real life.