وَإِنْ قَصَّ يَدًا أَوْ رِجْلًا فَعَلَيْهِ دَمٌ
Translation: If he trims the nails of one complete hand or one complete foot, an animal offering is due.
In this context, yadan aw rijlan means the nails of one complete hand or foot; it emphatically does not mean cutting off a limb. The object is shortened through an understood noun supplied by the context.
Trimming all five nails of one hand differs from trimming five nails distributed over different hands and feet, a distinct case discussed shortly.