Al-muhrim: a person in ihram, from the root ḥ-r-m.
Tawajjaha: directed himself or proceeded, Form V, root w-j-h.
Waqafa: stood, root w-q-f.
Saqata: fell away, root s-q-ṭ.
Li-tarkihi: because of omitting it; the suffix refers back to the arrival tawaf.
Together these words identify the circumstances and the result of the ruling.