I see what you're saying JimDandy, but I think that it is clear, especially in the second case, that behavior at least bordering on verbal assault was used on a very young child.
If they had suspended or even expelled these children they would be jerks, but within the law. School rules, school punishment, I get that.
An adult, in a loud voice, with no parent present, threatening arrest,which as people who were not officers of the law they clearly could not accomplish, seems to me to be the very definition of a terroristic threat. Clearly it worked, the child was terrorized.
Notice the parents weren't there while these children were being bullied, can you imagine what they (or you) would do if present at the time?
Gaily bedight, A gallant knight In sunshine and in shadow, Had journeyed long, Singing a song, In search of El Dorado