What was different about the Gilroy shooting? Every time a mass shooting happens anywhere in the US or the world, law enforcement and security analysts try to learn whatever they can about the motive, the method and the reaction. Below is our discussion with local security expert Hector Alvarez, who says increased security at these types of events is causing changes in the behavior and tactics of attackers. Those changes in tactics can reveal them if we understand the warning signs. He also weighs in on the single most important thing we can do to stay safe beyond what event planners can do.