sah-he; esah-certainly; bhagavan-lord; dronah-Dronacarya; praja-rupena-in the form of his son Asvatthama; vartate-is existing; tasya-his; atmanah-of the body; ardham-half; patni-wife; aste-living; na-no; anvagat-undertook; virasuh-having the son present; krpi-the sister of Krpacarya.