A Jew lent water, but during the plague of blood he returned water while the Egyptian received blood. Was the debt repaid?

This source-based Torah study examines the question: A Jew lent water, but during the plague of blood he returned water while the Egyptian received blood. Was the debt repaid? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the sources cited there, preserving the distinctions, tensions, and practical implications of the original text. This localized discovery layer does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.