3 And now he does himself in secret shroud,
shroud > hide
4 To fly the vengeance for his outrage due;
fly > flee, avoid for his outrage due > [due to him for his outrage]
5 But vain: for you shall dearly do him rue,
vain > vainly; in vain dearly > sorely; dearly do him > make him, cause him to (cf. "do him die", e.g. 109.54:8)
6 So God you speed, and send you good success;
speed > assist
7 Which we far off will here abide to view."
abide > remain