so > thus, in that manner

3 Till this madman, whom your victorious might 4 Has now fast bound, me met in middle space,

fast > firmly middle space > (Cf. 202.20:3)

5 As I her, so he me pursued apace,

apace > swiftly

6 And shortly overtook: I, breathing ire, 7 Sore chafed at my stay in such a case,

chafed > fretted stay > detention, hindrance

8 And with my heat kindled his cruel fire; 9 Which, kindled once, his mother did more rage inspire.

inspire > blow upon [his cruel fire, as if with bellows expelling rage]; also: inspire [in him]

204.33