vitir vel hvat ‘you know well why’: The thought seems to be that Bragi knows, or should know, what the commotion is about. See LP: 2. (*hvar eller *hver af hveR), hvat 3 for hvat in the sense ‘why’. It could alternatively mean ‘everything’, and is interpreted thus in LP: 2. (*hvar eller *hver af hveR), hvat 4. Hofmann (1955, 48) reads an otherwise unattested cpd velhvat, comparing OE welhwæt ‘everything’.