Suppose the fictional facts for the following question. Imagine Leon Dusk agrees to purchase a social network behemoth called Fritter. As such the parties enter into a contract wherein Mr. Dusk agrees to purchase Fritter for a lot of money. Subsequent to signing the contract Mr. Dusk's attorneys discover that Fritter has greatly exaggerated the number of persons with actual accounts with Fritter. Mr. Dusk gives notice of his intent to breach the agreement based on Fritter's misrepresentation of users. Fritter refuses to renegotiate a purchase price and instead sues Mr. Dusk in equity for specific performance of the contract.

Question: What defense could Leon Dusk raise to counter Fritter's claim for specific performance? What equitable maxim are you relying on?