Musa isn't angry because she isn't fearful she's extremely fearful, but she allows this fearfulness to cripple her in her own hero's journey.
Luke gets angry at an offensive threatening comment of bringing his sister into harm's way, and in that aspect Lukr's anger much like Bloom's anger against Valtor's rise up from a fear a very good place in their hearts and this is just being human.
Bloom's eyes also scream, "Pure Murder" in this picture against Valtor, Skylights. This is a way shorter chapter than most of these last few chapters because I think the message I'm getting at it is quite clear. See you in the next chapter if you are brave enough, Skylights, believe me I kid you not this analysis book was never for the faint of heart, guys.