The short section of pole is the pole splint. It is part of the repair kit and was designed to provide a quick easy field repair in the event of a broken pole. To use the pole splint, simply slide it over the damaged pole segment and tape or wedge it in place. This should keep your poles usable allowing you to finish your trip.
If your pole broke you can also email us at firstname.lastname@example.org to request a new pole segment and repair it at-home.