Tinker Bell answered insolently.
So there we have, right? Only Peter Pan can understand Tinker Bell...
Now hold on a moment! Don’t go zipping to conclusions. Here’s a bit of text regarding the Lost Boys:
“Hullo, Tink,” cried the wondering boys.
Tink’s reply rang out: “Peter wants you to shoot the Wendy.”
It was not in their nature to question when Peter ordered. “Let us do what Peter wishes!” cried the simple boys.
A-ha! So the boys make sense of her bell-voice, too. Before you go arguing that the boys are wont to say such a thing anyway as they are devoted to Peter’s wishes, surely you don’t forget they actually do shoot Wendy down, just as Tink says Peter commands. Obviously it’s not just a regurgitation of an ingrained desire (to obey Pan’s wishes.)
So why is it that the Boys can comprehend her as well as Pan? Perhaps it’s because they’re in the Neverland and therefore just do? No, that’s not it. Good guess, though. Perhaps they’re magical like Peter himself? Oh no, that can’t be it. They’re just not. Well, then, why?
For the answer, we’ll have to (but of course) look to Barrie’s words again:
She had said it so often that Wendy needed no translation.
“I almost agree with her,” Wendy snapped.
And so we arrive at the simple answer. If you’ve been around Tink for quite some time, would you understand her then? Yep.
Of course, Amy could not be described as a normal child, for she understood the fairy language perfectly. She had heard it so many times while passing through Kensington Gardens and in the twilight of slumber that she knew it quite well. Thus, she did not need a translator to converse with the fairy who just spoke to her.