The comma goes inside the quotation marks.
can we get some information on this first
Perhaps he meant that they both understood what the other character or thing was saying, without saying a word
Answer:
"Under the astonished, wide-eyed moon, with the fires casting strange shadows upon these towering figures, I am rather inclined to believe him."
Explanation:
The use of the words "astonished" and "wide-eyed" that are used to describe the non-human presence of the moon creates a feeling of wonder. It depicts a scene in which the moon is large (wide-eyed) and beautiful (astonished). This and the description of the fires and their shadows creates an almost magical scenario to help the reader envision what the narrator is seeing. The personification aids in this, allowing us to understand how the narrator <em>feels</em> as well (wonder).
The words "casting upon" can also be considered personification, but it is not relevant in this case.