skulu – 2^nd pers past subjunctive.

Gissur hvíti mælti þá við Mörð Valgarðsson: "Allmjög hefir þér yfir sést er
þú skyldir

Gissur the white spoke then with Mord Valgard's son, "You have seriously
overlooked (a major point) when you decided??

vágföll

fellur og vogföllin svo að lækur féll eftir gólfinu. Hann gekk nú út úr
búðinni óhaltur og

fell and ?? so that a stream fell back to the floor. He went now out from
the booth and not lame and