Final answer:
The experience from Berthe Lannis' perspective expresses a reciprocal, affectionate reaction to being noticed, characterized by a physical blush and an emotional flutter.
Step-by-step explanation:
Rewriting the experience from the perspective of Berthe Lannis, I would approach the original sentence, "When he saw Berthe Lannis in the distance, on the long yellow stretch of sand, he would tingle to the roots of his hair," and provide Berthe's internal reactions to the gaze. Let's transform the experience to resonate with Berthe's emotions:
"Whenever his eyes met mine from afar, across the golden ribbon of beach, a warm blush would blossom across my cheeks, stirring the butterflies within," expresses Berthe's reciprocal feelings as she notices the gaze and experiences a fluttering reaction characteristic of someone touched by affection.