This video walks through the phases of escalations with a focus on prevention strategies.
Quick look at stages and adult actions to prevent and manage escalations
Source: Colvin, G. and Sugai, G. 1989 Understanding & Managing Escalating Behavior – PBiS www.pbis.org; iris.peabody.vanderbilt.edu/; Lane, K. L., Menzies, H. M., Bruhn, A. L., and Crnobori, M. (2010) Managing Challenging Behaviors in Schools: Research-Based Strategies That Work. New York: Guilford Press.