User blog comment:Morganaforever/Morgana's torturer in 5x08/@comment-4892425-20121118193800

I think if Arthur found out this new ally locked up and tortured Morgana he would be furious but not in the way you think. After her second defeat at Camelot Morgana was on the run, and the knights were probably scouring the kingdom for her body. Since she didn't turn up they presumed she was dead, hence the three years of peace and prosperity in Camelot. If Arthur would have known about Morgana's capture the moment she was locked up he would have seeked extradition for her to stand trial in Camelot for treason and other high crimes. (Lord knows the evidence is overwhelming.) They would have gone for the death penalty and they would have gotten it. It doesn't matter at this point that Arthur and Morgana are blood; Morgana became a clear and present danger to the realm. The threat to the kingdom would have been immediately removed. Remember in 5 x 03 when the elder about to burn the old woman for witchcraft Arthur stopped it and demanded to know it there was a trial before the sentence was carried out. By locking her up and torturing her this guy gave Morgana time to get more vicious and time to reconstitute her powers. (Her powers had to be out all this time for this king to be albe to chain her up.) Now Morgana is more dangerous than ever. Once they get through this new attempt to overthrow the Crown I think Arthur would be more determined to deal with her decisively.