might not do him die > [could not kill him] ay > ever

9 And fierce he still appeared, the more he did him thrash.

still > ever, continually

307.33

He wist not, how him to despoile of life,
2 Ne how to win the wished victory,
Sith him he saw still stronger grow through strife,
4 And him selfe weaker through infirmity;
Greatly he grew enrag'd, and furiously
6 Hurling his sword away, he lightly lept
Vpon the beast, that with great cruelty
8 Rored, and raged to be vnder-kept:
Yet he perforce him held, and strokes vpon him hept.

1 He wist not how him to despoil of life,

wist > knew

2 Nor how to win the wished victory, 3 Sith him he saw still stronger grow through strife,

Sith > Since still > ever; yet

4 And himself weaker through infirmity;