In case anyone is curious about what else they could learn about Crisis De-Escalation, including what to do in a situation of violence, there is another workshop Train the Trainer series available through The Canadian Training Institute: http://www.canadiantraininginstitute.com/train-the-trainer-for-crisis-intervention.
If there are staff out there who work in closer capacity with hostile situations, or encounter them more frequently, this might be a good workshop for them. It teaches how to manage and recognize the dynamics of anger, understand self-awareness of our professional and personal reactions in hostile situations, and understanding our environment and how we could increase its overall safety.
The best part about this program seems to be that it is highly experiential and hands on through the use of simulations.
Click the link above for further information.