S4 Finale - Ben's reflection scene

The scene: When Ben, Locke and Hurley are walking to the cabin and Ben takes out that piece of glass from under the rock and starts "communicating" with supposedly Jacob

I know from The Incident that Ben never talked to Jacob but in this scene it does look like something is reflecting back from the mountain even when Ben's not pointing at it.

What is this? Or am I just overthinking it?

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