"They are admiring the knights."
I think I know why Azantyssy diesn't work but if someone could elaborate anyway..that would be great
Azantyssy is the nominative case - that's classically the case used for the sunject of a sentence. Azantī is the accusative case, which is used to mark the direct object. "Azantyssy majaqsa" would mean "The knights admire", but the sentence would be ungrammatical, since majaqagon is a transitive verb and needs a direct object.