I'm happy to learn new idioms, but in the context of the lesson, without visiting the discussion, the real value is lost. In isolation it's just a bizarre sentence.
What does this mean ? It seems like something we would say differently in English, but I don't know what exactly.
This comes from the first part of the Czech saying Jak se do lesa volá, tak se z lesa ozývá.
We do accept "What goes around?" as a translation. I suspect a few literal translations are missing for the narrow situation in which one is standing in the woods and yelling something out, about to hear it back.