A woman and a male companion were travelling in a vehicle in Bellvue, Colo. when they got into an altercation. After the woman pulled the vehicle over and attempted to call 911, the man followed her and stabbed her. A passerby noticed the scene, retrieved a firearm and held the attacker at gunpoint until police could arrive. (KUSA, Denver, Colo. 06/04/16, Coloradoan, Fort Collins, Colo. 06/04/16)
http://www.9news.com/news/crime/witness-holds-stabbing-suspect-at-gunpoint/231790490