User blog comment:Morganaforever/Series 4 Cliffhanger/@comment-4135736-20120223124114

I reckon the reason why Morgana teleported out of Camelot was because her own magic was protecting her when Merlin blasted her even though her powers were disabled (similar to Merlin surviving the Dorocha's touch in The Darkest Hour even though he couldn't defend himself from them). The most likely reason why Aithusa saved Morgana was definately because he sensed some good deep inside her and saved her hoping that one day she would redeem herself.