I agree but the author might be implying that this was not the first thought and that creates dramatic tension. What triggered the memory? Was he recalling it o

I agree but the author might be implying that this was not the first thought and that creates dramatic tension. What triggered the memory? Was he recalling it on purpose to inform his next move? Was he forced to remember because the leader of the firing squad also figured in the memory but he didn't realize it at first?