What does Daniel 3:15 mean?

'Now, if you’re ready, when you hear the music, fall down and worship the statue I made. If you don’t, you’ll be thrown right away into the blazing furnace. And what god could possibly save you from my power?' Daniel 3:15 - Modern Text Bible

(The king gives them one last chance, but also mocks their faith, claiming no god can rescue them from him.)