The Green Man of Knowledge

The Green Man of Knowledge is a Scottish folktale collected in 1954 and published in 1958, in the academic journal Scottish Studies. It is classified in the international Aarne-Thompson-Uther Index as tale type ATU 313, "Girl Helps the Hero Flee" or "The Magic Flight", in that the hero falls under the power of an antagonist and forced to perform impossible tasks, but he is secretly helped by the antagonist's maid or magical daughter, and both escape from his captor by throwing behind objects to create obstacles that hinder his pursuit.

Source: Wikipedia — The Green Man of Knowledge (CC BY-SA 4.0)