וְהָיָ֞ה אִם־לֹ֧א חָפַ֣צְתָּ בָּ֗הּ וְשִׁלַּחְתָּהּ֙ לְנַפְשָׁ֔הּ וּמָכֹ֥ר לֹא־תִמְכְּרֶ֖נָּה בַּכָּ֑סֶף לֹא־תִתְעַמֵּ֣ר בָּ֔הּ תַּ֖חַת אֲשֶׁ֥ר עִנִּיתָֽהּ׃ (ס)
И если ты не получишь от нее удовольствия, то отпустишь ее, куда она пожелает; но ты не будешь продавать ее вообще за деньги, ты не будешь иметь дело с ней как с рабом, потому что ты смирил ее.
Ramban
AND HE LAY WITH HER, AND HE AFFLICTED HER. He lay with her in natural gratification; and he afflicted her unnaturally. This is Rashi’s language. But Rabbi Abraham ibn Ezra said: And he afflicted her naturally because she was a maiden.” But there is no need for this for all forced sexual connection is called “affliction.” Likewise, Thou shalt not deal with her as a slave, because thou hast afflicted her.126Deuteronomy 21:14. And so also: And my concubine they afflicted, and she is dead.127Judges 20:5. Scripture thus tells — in Dinah’s praise — that she was forced, and she did not consent to the prince of the country.
Ibn Ezra
This instance of the verb enslaves means the same as its fellow [21: 14].
HaKtav VeHaKabalah
A living soul. This alludes to the unique human capacity for free choice. The word nefesh — “soul” — indicates desire, as in Devarim 21:14. The implication is that only human beings were created to exercise their free will.