> > "Er hann ok ekki reyndr," segir hún, "vilda ek ok ekki heldr, at Björn brygði honum því, at hann þyrði ekki at berjast með þér í orrostu."
> > he is (untried/untested ??) said she, "I will not want him to argue (fight) with Bjorn be could not best (or beat him)in a fight

Oopsh.  Ignore my first take at this sentence.  I know what´s going on here:

"vilda ek ok ekki heldr, at Björn brygði honum því, at hann þyrði ekki at berjast með þér í orrostu."

"but then (on the other hand), I wouldn´t want Björn to accuse him of not daring to fight at your side in battle."  (cf. Zoega bregða (7)).  Sorry about that...

LN