How does huck show that he has a conscious?

Having lost their raft, Huck and Jim search along the crashed ferryboat for the robbers' skiff. Just as they find it, the two robbers emerge and place the goods they have looted into the skiff. The robbers then remember that their partner still has his share of the money, so they return to steal it from him. Before they can return back to the boat, Huck and Jim jump into the skiff, cut the rope, and speed away downstream. Huck then goes ashore and finds a ferry night-watchman. To try to save the robbers, because he feels guilty leaving them for dead, he tells the man that his family ran into the wreck while traveling downriver and that they are stuck there.