 MacLeod and Mees state that the opening lines of the charm correspond to the Poetic Edda poem Sigrdrífumál , where the valkyrie Sigrdrífa provides runic advice , and that the meaning of the term skag is unclear , but a cognate exists in Helgakviða Hundingsbana I where Sinfjötli accuses Guðmundr of having once been a " skass @-@ valkyrie " . MacLeod and Mees believe the word means something like " supernatural sending " , and that this points to a connection to the Ragnhild Tregagás charm , where a valkyrie is also " sent forth " . 
