The figurative language is a metaphor. That is because she didn't literally burn out by one fierce moment of fire, it's a metaphor to show the strong burst of emotions that she had at that moment that made her feel as if she was burning. It could mean either that she got angry or fell in love or anything similar.
Answer:
No, they most likely don't anymore today because we have satellite technology and unmanned drone spy planes.
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The plot of "The Signalman" reaches a climax when signalman dies. As you know, the main characteristic of climax is that it is the most emotional part of a story that provides a lot of interest and suspense to a reader. The death of signalman is the highest point of emotional intensity of the plot as the loved protagonist unexpectedly (or undesirably) passes away and put an end to the story.
They valued family, I believe.