4 Dismay with fear, or cause on foot to fly,
on > (See Textual Appendix) fly > flee
5 But either hellish fiends, or powers on high:
But > Unless [it be]
6 Which was the cause, when erst that horn I heard,
erst > first
7 Weening it had been thunder in the sky,
Weening > Supposing, believing
8 I hid myself from it, as one afeard;
afeard > frightened