Sentence:  And thenne the grene knyghte kneled doune / and dyd hym homage with his swerd / thenne said the damoisel me repenteth grene knyghte of your dommage / and of youre broders dethe the black knyghte / for of your helpe I had grete <WSD>myster</WSD> / For I drede me sore to passe this forest / Nay drede you not sayd the grene knyghte / for ye shal lodge with me this nyghte / and to morne I shalle helpe you thorou this forest<!--Prior quote:for of your helpe I had grete mystir: For I drede me sore to passe this foreste.--> 
Meaning of the word marked with <WSD> tags:  Need (of something).