I appreciate that you listed "Stay Calm" first as it is essential to handing any situation. I am someone who has strong reactions to things and staying calm for me does not necessarily mean I don't have feelings, like anger or fear. It means that I am in charge of my feelings. We cannot control our emotions, but we can be in dominion of them. Staying present in the midst of a challenging situation helps me make a conscious choice about how I am going to deal with it. A tool I use is to be aware of my personal space boundary. When I sense an energetic boundary around myself and what or who I'm reacting to outside of it, it helps me become more objective. I can then see the person I'm reacting to with with less judgment and greater insight. It helps be become curious about why someone is behaving the way they are, rather than wanting them to behave differently.