Classicly

They'll let you have it anyway, Granger thought grimly. He slowly curled his finger around the trigger and started to move when he was jarred off his feet by a roaring blast that ripped the door from its hinges and sent it crashing against the rear wall of the cabin.

Outside the ruined entrance stood a group of aliens all armed. Fearfully, he looked to the window, but their leader was gone. In a second he appeared at the door, moved inside the cabin, and Granger automatically stepped back, his hazy mind calculating roughly the few feet of escape route remaining to him. In a moment he was there, his back flattened against the cabin wall.