Which of the following is a “rule” that you should pay attention to when taking photographs?

hand hold your camera when taking night photographs

put diagonal lines directly at the corners

make sure your lines are straight

all of the above

London includes a quote about john thornton as he is observing hal attempt to motivate the exhausted dogs "it was idle, he knew, to get between a fool and his folly". if the word "idle" is defined as "of no real worth, importance, or significance", what does this statement mean with regard to hal? who is the fool? what is hal's folly? why would john thornton think it of no real worth or useless to intervene?