daily lessons, john, south africa, machete, knife, grappling, hand to hand, screaming, phone ringing, office, carrying, concealing, firearm, gun, desks, leveraging arm, distance, no shots fired, knife to a gun fight, gun to a knife fight, leverage, drops, magazine, wrestling, martial arts, aggravated, assault, deadly, threat, gives up, good guy wins, bystanders, on phone, at work, closing gap