[4] sem ek vissa ‘as I learned’: (a) This is understood here as modifying the clause beginning skeið ‘warship(s)’ immediately preceding it (so Skald). (b) In Skj B it modifies ll. 1-2, with skeið helt mǫrg í móðu mislǫng ‘many warships of various lengths proceeded into the river’ (ll. 3-4) functioning parenthetically; the prose order given in ÍF 35 suggests the same. This is presumably on the grounds that ll. 1-2 make a more important statement, but, as Kock (NN §582) points out, the second helmingr continues the narrative of the ships’ progress, which favours (a). (c) A further possibility is that sem ek vissa qualifies the entire first helmingr.