You know the more I think on this I wonder if the “Listen” goes into some metaphor about fireworks in the sky because of the whole, “Unchanging sky, unchanging sea” thing Haru was saying in the preview that Mako responded with something like, “They don’t look like it, but they’re changing, like us.”  I bet that listen goes something like, “Listen… to the fireworks… look at them exploding in the sky.  They’re changing it, and its beautiful.”  Or something more deep than I can come up with when I’ve just woken up.