How does Huck feel about Jim's decision to wait for a doctor?

In this last episode of the novel, Tom is shot in the leg trying to get the mob of farmers coming to get Jim from the shack to chase him instead of Huck and Jim.  When Huck and Jim find Tom, Jim tells Huck to go get a doctor, and he will stay with Tom.  Huck is surprised by Jim’s kindness because instead of continuing to run, Jim puts his freedom at risk to save Tom.  It is at this point that Huck says that he knows Jim is “white inside.”  The word, “white,” has a different meaning here and is not about race.  The color white is a symbol of purity, innocence, and goodness.  Huck realizes once again that Jim is a compassionate person who firmly believes in doing the right thing.  As Jim shows throughout the novel to Huck, he is a father figure who will not abandon a child when he needs him even though it may have terrible consequences for himself.