Board Thread:Series 5 Discussion/@comment-5654429-20121110110834/@comment-4623180-20121110111808

Good question. Series 5 has left us with many questions. I think since they were so close to each other for those 2 years of imprisonment, Aithusa telepathically communicated it to Morgana.

Or, that Aithusa spoke for a period before she was captured, and told Morgana then, and stopped talking during captivity.