Because he should have yashab (inhabit/dwell) in his iyar (city) of maqalat (refuge) until the mawath (death) of the gadawal (very great/important/mighty) kahan (priest): but achar (other) the mawath (death) of the gadawal (very great/important/mighty) kahan (priest) the manslayer shall shawab (turn) into the aratz (Earth/land) of his achazah (possession).