Actually, the children in both these cases were very articulate in their reports of what they saw (and precise in their drawings of it) and also specific in cases in which they understood what the alien expressed telepathically.
As I recall, teachers were not present on the playground at Zimbabwe, at least near the area in which the landing took place.
As you can probably gather from most of what I write here, I do not believe that "the phenomenon" is "screwing with us." There are other ways to explain the irrational responses of humans to encounters with ufos and aliens. Also, I do not think there is such a thing as a 'single, unified phenomenon' that can account for all the varieties of paranormal, psychic, mystical, and spiritual experiences had by humans throughout our recorded history. I think it's a mistake to gather all of these types of experience into a single category and attempt to explain them in terms of a single intentional phenomenon.