Final answer:
Scout is initially shocked when she discovers Boo Radley saved her and Jem, but she quickly transitions to gratitude and empathy as she understands the real, protective nature of the enigmatic figure.
Step-by-step explanation:
Scout's reaction when she realizes who saved her and Jem is one of shock, confusion, and finally, understanding. In Harper Lee's To Kill a Mockingbird, the character Arthur 'Boo' Radley is a recluse who is seldom seen by the town's inhabitants, and thus is a figure shrouded in mystery, particularly fascinating for Scout and her brother, Jem. However, when she discovers that it's Boo who has come to their rescue after an attack by Mr. Ewell, Scout's perception of him changes dramatically from a subject of childhood superstition to a real-life hero and protector. This revelation brings a profound sense of gratitude and empathy from Scout, as she begins to appreciate the humanity of the enigmatic figure who was once merely a source of local legend.