I'm wondering whose shooting at them, could it be the others because they've been told by Ben to shoot at anyone coming. And maybe Ben had set up Danielle and Karl because of his feeling for his so called daughter has it been revealed that Ben is really her father and (grasp!!!) had sex with Danielle after her arriving on the island. Yeah we need to know her back story I'm almost sure Danielle is wearing a vest she's been on the island long enough to know anything and everything can happen.

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Standing in the ocean with the sun burning low in the west
Like a fire in the cavernous darkness at the heart of the beast
With my beliefs and possessions, stopped at the frontier in my chest
At the edge of my country, my back to the sea, looking east