[HerenIstarion]

Exclude clause A.

Morgoth (probably) would have been afraid to come out "for though his might was greatest of all things in this world, alone of the Valar he knew fear". And his duel with Fingolfin is stated to be the last skirmish Morgoth participated in in person. There have been some knocking on his doors and shouting of "come out" in times preceeding the battle discussed (Feanor upon landing almost there, and Fingolfin's march to the doors), but he did not bother himself to get out of his cosy armchair (or off hard and cruel throne) to make battle in person back than too: "Then the Elves smote upon the gates of Angband, and the challenge of their trumpets shook the towers of Thangorodrim; and Maedhros heard them amid his torment and cried aloud, but his voice was lost in the echoes of the stone"