Yes but is the whole scene from Elven perspective?
AEGNOR: Brother! Listen to that demon! It speaks...what does it say?
ANGROD: It sounds like the language of the Ainur!
AEGNOR: Yes, you are right!
ANGROD: It says something about slavery and someone terrible?
AEGNOR: Terrible slaves?
ANGROD: No...slavery is terrible?
AEGNOR: Terror is slavery?
AEGNOR: Brother! Listen to that demon! It speaks...what does it say?
ANGROD: It sounds like the language of the Ainur!
AEGNOR: Yes, you are right!
ANGROD: It says something about slavery and someone terrible?
AEGNOR: Terrible slaves?
ANGROD: No...slavery is terrible?
AEGNOR: Terror is slavery?