Sidon fumbled to recover his dignity at being called out. "You wound me to think that you didn't," he said, trying to sound insulted, and completely failing. Then he nodded up at his sister's statue. "I had simply noticed that it wasn't just the people you were apparently here to see."
All right, so that wasn't his smoothest of recoveries. He was still trying to figure out why Link seemed to carry an impression of Mipha's spirit with him. Sidon was certain it was more than just his association of the young Hylian to his sister. He'd heard that impression from miles up, with no idea that Link was even there.
Either figure it out, or figure out how to ask about it, because that seemed a bit of a strange question to ask, if not phrased just right.