For a small toad a shrub is a tree. And bushes - a whole forest. Sometimes this forest can be "une forêt de Bondy", the one having a horrible reputation, a cursed place where Childéric II, a grandson of
Dagobert was assassinated, also it was frequented by the brigands and ruffians. There is also Birnam Forest in Macbeth, a nightmarish harbinger of main character's fall. And Brocéliande - which has few parallels to the drama here. In it, as in Chrétien de Troyes' version, Ywain pours the water from a well over a stone, causing a storm and suddenly a knight appears that guards the forest. Then Ywain kills the knight...
