When Eragon wakes up, there's a campfire going. Sitting near it is a stranger with a "serious face and fierce eyes […] framed by locks of brown hair. He [appears] to be a few years older than Eragon and perhaps an inch or so taller" (36.6).
Dude says his name is Murtagh. He's also an enemy of the Ra'zac.
Eragon uses magic to untie himself. He's in bad shape. Brom, meanwhile, is in even worse shape. The dagger went right between his ribs.
Eragon needs to heal Brom with magic, but he's too weak. Saphira offers to lend him her power to cast the spell.
With her help, he heals Brom's wound, but only the surface.
Eragon's really weak, so Murtagh offers him some soup. Soup! It always makes us feel better.
After his soup, Eragon says that they need to get out of there, before the Ra'zac come back with their buddies.
Brom can't ride, but Saphira can carry him in a litter (like a makeshift stretcher).
Eragon tells Murtagh to go his own way, to save himself from the danger that he and Brom (and Saphira) are in.
Murtagh says thanks but no thanks. Besides, they need his help, and he wants to see what kind of interesting things happen to a real, live Dragon Rider.
Suit yourself, Murtagh.
They ride through the night and come to a sandstone cave around dawn.
They make camp in the cave and grab a bite to eat. Brom refuses to drink water.