Most of the group managed to stay fairly well on the path, but being less used to travelling than the others Bilbo had begun to lag behind. His legs were shorter than even those of the dwarves and already they were throbbing from the strain of the uphill climb along the mountain pass. Not watching where he had been putting them, the hobbit stepped too close to the edge and his foot slipped off, sending him tumbling over the edge though he managed to grab hold of the side with his fingers so he didn't plummet to the bottom.

"Where's Bilbo?!"
"Where's the hobbit?!" Bofur and Dwalin began to shout as they suddenly noticed that Bilbo was not among the group.
"Heeeellppp!!!" the hobbit cried out as loud as he could, hoping somebody would hear him and pull him back up to safety.