Board Thread:Rewatching "Merlin" - Season Four/@comment-5102537-20131130132300/@comment-5367080-20131205190747

Aithusa had no voice because of his imprisonment. And as he grew in the cell, he was unable to fit and was therefore crippled, presumably this or the fact that he had no association with another dragon is the likely cause of his lack of voice as he has no one to learn from.

As for a grudge, he had spent maybe five/ six years in a cell with Morgana, thats where his loyalty to Morgana comes from, why would he be loyal to Camelot? What has Camelot ever done for him? Even Merlin abandoned him for five/ six years in the Sarrum's cells. He likely had what Camelot did to Morgana against it, and therefore helped Morgana out of loyalty and love.

Finally, the Sarrum how the Sarrum captured Aithusa is hard to say, but what must be remembered is he was quite small at the time, maybe about the size he was at the end of Series 4, at this size he wouldn't be hard to catch if they could find him.

As for Morgana, Aithusa was used as bait, stand down or Aithusa dies was the main thing, and once in the cell there wasn't much she could do, she can't fly and any attempt to leave would cause Sarrum to kill Aithusa.

As for the destruction of Camelot, not even the Great Dragon could do catastrophic damage to Camelot so why would Morgana fly out an adolescent dragon to try it out? She would essentially be killing off her closest friend on a suicide mission.

Last thing, Morgana's not the most powerful sorcerer, Merlin is :P