Shocked as she was by Horus' announcement, she wasn't about to give into the emotions in front of her brother. She needed to take care of him first. Time to worry about Horus when Set was gone.
Looking at the toad, she spoke softly. "Are we agreed then? Will you concede, leaving the land to Horus, and departing Egypt? As I see it, you really have little choice." Nor do I, it appears.
The toad settled, lowering his head. "Very well. We have an bargain."
With a flash of light, the case shattered, and Set himself stood before her.