Why did the Tabernacle vessels not become impure when Nadab and Abihu died inside the sanctuary, if a corpse conveys impurity under a roof?

This source-based Torah study examines the question: Why did the Tabernacle vessels not become impure when Nadab and Abihu died inside the sanctuary, if a corpse conveys impurity under a roof? 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.