her before > [to be seated opposite Hellenore]
3 But he himself sat looking still askance,
he > [Malbecco] still > ever, continually; or perhaps: yet (if suspecting that Britomart might yet be a man)
4 Gainst Britomart, and ever closely eyed
Gainst > Against, facing
5 Sir Satyrane, that glances might not glide:
that > [so that]
6 But his blind eye, that sided Paridell,
sided > [was side by side with; hence: was on the side of]
7 All his demeanour from his sight did hide: