[2] at skyldu ‘that they should’: This could conceivably be taken as a prepositional phrase meaning ‘according to [their] duty’ (so Fms 12, 40, 242-3). The variant skuldum in 54 and Bb is probably dat. pl. of the noun skuld f. ‘duty, due’ rather than the 1st pers. pl. pret. form of the verb skulu ‘shall’.