Adjectives and Adverb phrases relate to prepositional phrases because if you remember what an adjective is, it describes a noun and then an adverb i believe can describe a verb, adjective, and other adverbs. Both adjective and adverb phrases contain prepositions, there fore relating them to prepositional phrases.... I hope this is what you were looking for and answered your question... :)
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In general Huck is a character who tends to separate himself from people he disagrees with. If someone thinks something in a different way than he does, Huck will be grim about it and won't have the desire for that person to be near him or he won't even listen to them. Often it happens that he has to do it even if he doesn't want to.