It sounds like the Union didn't have much choice.
Maybe the council will reconsider!

The union is sending advice to its 8,500 members across Scotland warning them to THINK CAREFULLY before stepping into similar situations.

I don't think they are telling them to stop....

It's all fine the union saying don't put yourself at risk, but what will people say when one child kills another eventually?? Cos thats what will happen in the end with no one to break it up. Kids will notice the pattern of teachers not doing a thing and take advantage of this. I can hear the cries of "Why didnt anyone do anything?" already. I bet its the teachers who get blamed too and not the council for driving them to this decision

Throw a bucket of ice-cold water over them (the fighting kids, not the teachers. ) That'll soon stop them.