Final answer:
When Rumpelstiltskin stomped, it led to the revealing of his identity and loss of his bargain, a pivotal moment in the fairy tale.
Step-by-step explanation:
The question refers to the event that happened in the story of Rumpelstiltskin, which is a classic fairy tale. When Rumpelstiltskin stomped so hard that the ground cracked, this act initiated the climax of the tale, where his identity is discovered, and he loses his bargain.
In various versions of the story, it may be depicted as him being so angry that he splits himself into two or simply disappears, depending on the narrative.