"A heart that believes. I heard them call it 'the heart of the truest believer'."

He could stop there, he had answered the question asked of him after all. However, he knew that the answer would cause more questions and perhaps it'd be better to answer what he thought might be asked and hope that whatever questions followed weren't as hard to answer.

"Pan wasn't always immortal and the magic that is keeping him young and alive is coming to it's end. Unfortunately, he found a way around that. If he gets his hands on Henry's heart, it will render him truly immortal, we were working to prevent that come coming about when I was brought here. We being Henry's family." And Hook, but all the pirate really did in his mind was provide the means of transport and save Charming from dying after a fashion.