A tip for de-escalation!
Even when using the above steps, there may be a rare situation when you can be unsuccessful in the attempt to decrease the chances of a conflict and reduce someone's anger and frustration. But in the process, the facilitator shouldn't let any of them affect his emotions and become angry as it will not be helpful to anyone.
Anyone intervening in an emotionally charged situation should always have a plan to step back or pause to manage his own emotions and get help if needed and remember to always stay calm.
When out of control people sense that their angry responses scaring and uncomforting others and they are controlling the situation environment, it can increase their sense of power and control leading to an increase in the escalation of the situation.
The facilitators must stay calm and act as if they are in control of the entire situation and themselves.