The room that Erron found himself standing contained a floating picture much alike the strange one in the swamp, with the notable distinction that this picture rather than showing the insides of a dungeon, showed the swamp scene he had just left, complete with the none-to-distant, crumbling castle.
The cobblestone room you are in is lit brightly by a sunrod that lays upon the ground where Horgold had stood moments before, and contains a door to the east and west. The room tapers from over thirty feet wide at the north end, to a ten foot wide hallway to the south, which turns sharply to the east after but a short span.
An elf stands just through the western doorway, which stands open and reveals a hallway that turns to the north after ten feet or so. That elf wears the dark leather and forest greens, and his hair hangs in innumerous thin braids, a number of which have strange items tied into the very tips, a bead, a feather, a stud of metal, a claw, a tooth. These braids clink together lightly as the elf moves, but at the moment, he stands silent and unmoving, mouth set in a grim line, and arms raised to hold a great bow that stands almost a full six feet in length, an arrow knocked and pointed in Erron's direction.