User blog comment:Merlinmania/Arthur's Bane/@comment-4814726-20120807030757/@comment-5350801-20120812184313

The dragons still have a mind of their own. Aithusa could be made to do what Merlin wants. Remember in The Crystal Cave how Merlin had to order Kilgharrah to give him the help he needed to save Morgana. Kilgharrah didn't want to because his loyalty was to Merlin and felt saving Morgana was a mistake. IF he was never ordered to, he never woulda done it.

Besides we don't know why the dragon saved Morgana. Maybe that will be explained in season/series 5. As much as I hated it, maybe Aithusa saw she was in trouble and knew how to heal and it did. (I use it cause I don't recall if they ever said if Aithusa was a boy or girl)