It was all him dying
When someone dies, their brain creates a lucid dream full of wonderful thoughts to keep them from suffering, such as near death experience dreams "of going to heaven," while someone is clinically dead. I believe the story of lady in the water was all in the superintendent's head as he was drowning to death peacefully in the pool after slipping and falling, and rolling into the pool. He had seen a trespasser who had been getting her chill on in the pool for the past couple of nights in the after pool hours. That's the M. Night twist for this wonderful movie!
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