fights = tial by combat

http://en.wikipedia.org/wiki/Trial_by_combat

The first two fights show the characteristics of a trial by combat.

Two autographs

If scribe B uses older lettering [Kiernan, Revisions],
if Part II is an older codex or autograph,
then that might explain the absence of the word Scylding and its likes in part two.
It might account for its less intricate, almost self-contained character.
So I started re-reading from l.2200 ff...