Didn't Captain Gault fire Keamy gun just as Keamy was forcing the pilot to fly them back to the island? And had it pointed at Keamy until Gault seen whatever it was that was attach to Keamy and when Gault turn to ask what that was on Keamy and Keamy shot Gault. Then the pilot said we're flying after seeing Keamy take not only the doctor life but also the captain. Guess the pilot had already thought of a way to warn the losties when all this was taking place.

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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