"...never. It can't swap the same two people twice."

"...never. It can't swap the same two people twice. You're stuck like that forever, I fear," Impa continued, seriousness returning to her voice.

To Link's surprise, Fi shook her head and replied, "Incorrect. Mathematically, we only require two more people in order to return to our original bodies. Consider them Human A and Human B," she said, continuing. It really weirded out Link how dry and serious his own voice sounded when Fi used it. "If Master Link uses the crossbow with Human A and I use it with Human B, then Humans A and B use the crossbow, then Link's body and human A uses it, while my body and Human A uses it, everyone will have returned to their original bodies." A small smile of satisfaction found itself on Fi's face as she finished speaking.

Impa nodded, clearly impressed. "That is actually true. There is hope, after all. Only one issue: the crossbow needs a week to recharge between uses. So this plan will take at least," Impa started counting, then finished, "five weeks to work."

Thinking about it, Link sighed, but said that they'd have to do that then, it was ultimately their only choice. In the meantime...