[1] The twins had opposite natures: the right-handed twin was truthful, and the left-handed twin was deceitful. [2] The right-handed twin always did the right thing, and the left-handed twin always did everything backward. [3] In these ways, the brothers represented the two warring natures that are in all people. [4] Quarreling constantly, they used magical powers to create animals that fought one another, and to create plants and medicines that could be used for good or for evil.

Which best describes sentence 2?