I hope I'm not the only one being annoyed by people commenting about the 21st numbered chapter, whereas the first 16 chapters, not numbered, should be considered. So, Chapter number 21 is actually the 37th chapter. C'mon people don't make this a mess.
About the chapter: holy god that prophecy, combined with this design and portrait of Zodd, is absolutely majestic.
And Casca being irrational, even if... Guts could have waited, for sure. But hey, hasn't Griffith considered that part of him?