The scenario in the statement describes the foreshadowing literary device. Foreshadowing is the author's hint or advice of what comes next in the story. In both of the scenes, it tells us that a lightning will strike on Jane and Rochester's engagement.
The Foreshadowing is a literary device where the writer gives to the reader an advanced hint of what is coming to the story, the author uses it to create expectations in the public about what going to happen next, in this example the split of the three represented the future split between Jane and Rochester.
The thesis relates to your supporting evidence because you are stating what you want to say in your thesis and your supporting evidence backs up your thesis.
