Sidon didn't bother even trying to be surprised that Link had seemingly read his mind so well. Or perhaps his expression was showing more than he'd intended. Or maybe it was just a shared thought. Either way, Sidon didn't question it.
"I was at the foot of the mountain when it happened," Sidon replied, just as quietly. "I'd hoped that my sister might linger, just a moment longer, to say goodbye, but it was only a few seconds after Ganon's sealing that she was gone."