Blast the closest goblin with a pistol as soon as he's out of eyesight of the others -- with luck, they'd decide that he's the one doing the shooting. Engage others with the shotgun...face it, your friends are dead meat unless they are incredibly lucky and all you can do is try to shorten the amount of time that the goblins have to do them in. I'd expect the one holding your pal at gun point to turn and face the new threat instead of shooting first anyway...
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