I think this song has to do with Cassandra's curse. She was so beautiful that Apollo gave her the power of prophecy, but she didn't love him so she was cursed. No one would ever believe her predictions. This song is probably about her warning the Trojans about the Greeks and their famous Trojan horse trick, and having no one believe her until the Greeks storm the city (the slaughterhouse?). This is how Apollo takes his revenge and tortures her.
I think this song has to do with Cassandra's curse. She was so beautiful that Apollo gave her the power of prophecy, but she didn't love him so she was cursed. No one would ever believe her predictions. This song is probably about her warning the Trojans about the Greeks and their famous Trojan horse trick, and having no one believe her until the Greeks storm the city (the slaughterhouse?). This is how Apollo takes his revenge and tortures her.