Why does Mae react so strongly to the stranger and plan and how does this scene mark a turning point for Winnie?

Mae reacts strongly to the stranger's plan because it threatens the secrecy and safety of her family's existence, as well as the preciousness of their immortality. This confrontation highlights her protective instincts and the lengths she will go to safeguard her loved ones. This scene marks a turning point for Winnie as she begins to recognize the complexities of life, death, and the consequences of eternal life, ultimately leading her to reevaluate her own desires and the implications of the Tuck family's choices.