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Would you want to send you children to school in an era where schools are a combat zone and respect for teachers is nil? Yes, there have been school fights as long as we’ve had schools, but events like this were virtually unheard of when I was at high school.
How the children really view the teacher is clear in this video, and I think that he did very well in a situation where he could never prevail and faced a real risk of injury.
Was this a riot? Consider this definition from S87 of the Crimes Act and decide for yourself:
A riot is a group of 6 or more persons who, acting together, are using violence against persons or property to the alarm of persons in the neighbourhood of that group.