I just finished the game with all items collected, and I'm left with a question about the Dark Star Lord Footprints puzzle.

During my playthrough, I only used three mantra strings from this puzzle. I used the two strings associated with the sigil symbols to open the Duat Room and Aten-Ra and the one mantra string associated with the asterisk looking symbol to open nibiru. However, I never used the mantra strings associated with the two circular symbols. Was there something that I missed or were these strings just not used?

According to my notes, the two unused strings should be:

Scream, Night, Eternal, Moon, Moon/Roof (depending on Gate of the Dead orientation)

Fire, Water, Wind, Wind, Sea/Water (why is water part of this string?)