"No One is Coming to Save You" is the first rule of Matt Graham's Killhouse class, and is one of the truest statements you can live by when it comes to personal safety. The Killhouse remains one of the best training opportunities I've ever had, and caused me to rethink a great deal of how I approached not only movement within a structure, but my everyday tactics and observational skills. Matt is an awesome instructor with an incredible knowledge base. I have always paid for my own training, and every mile driven and dollar spent on this class was worth it.
In 14 years of law enforcement, I had only a handful of chances to interact with violent felonies in progress. I've worked tens of thousands of calls, many of which involved property damage, physical violence, threats of violence, and gun/knife violence. I've responded to execution style murders, shootings, domestic disputes, robberies, incest rapes, and property disputes where grown adults acted like children. One person I arrested on a warrant had beaten his wife unconscious then disfigured her by pouring hot oil onto her face while she lay on the floor. Law Enforcement does generally try to end immediate violence to innocents when encountering it. With that said, it's rare that officers will arrive in time to do that. Consider that the average response time for law enforcement officers is usually upwards of 10 minutes under the best circumstances. Realistically, the event is over by the time cops arrive. In rare instances, I was able to have some sort of impact on the victim's circumstances.