One of the first most important scenes in "The Leap" is the flashback at the beginning. The narrator said he owed her for his existence 3 times. This was one of them. She was doing a trapeze act with others, when a terrible storm hit and she fell in the air, blindfolded. In "The Leap," it says "Her body twisted towards a heavy wire and she managed to hang on to the braided metal, still hot from the lightning strike." She survived this. This is important because if she hadn't, the narrator would not have been born, which is why he is grateful she saved him. Here, you can see her at the top hanging onto the metal, with fellow others to the side.
Another important scene in "The Leap" is the flashback of the time she had to spend in the hospital. This is where she meets her second husband. In "The Leap," it says "In return for stories of her adventures, he graded her first exercises. He bought her her first book. . .they fell in love." This is important because if they had never met, the narrator wouldn't have been born once more. Here, you can see her on the bed reading to a man, who would be her husband.
The third most important scene in "The Leap" is another flashback of when the narrator was in a fire. His mom, the woman throughout the story, saved his life in an unexpecting way. "The Leap" describes like this; "There were plenty of people in the crowd and many who still remember, or think they do, my mother's leap through the ice-dark air toward that thinnest extension, and how she broke the branch falling so that it cracked in her hands. . . " This is important because earlier, it said there was no other way for him to escape. She saved his life and his existence for a third time.