
Well, i still sympathize with him(not after the spoiler you posted) because he just seems like a victim of the situation.
He was a slave before all this and is then bought by Penelope who treats him well in who knows how long. He mistakes that as love and doesn't understand Penelopes side of the situation. He is brainwashed to bring Yvonne (or atleast i believe that from the jail scene) and now this. He pretty much is the way he is because he has nothing else other than Penelope, who's like a saviour and a God for him. I kinda wish he would've had another ending, that he'd have remain as a faithful knight and help Penelope.
I love our Penelope but also, I can't really hate on ecklis. Well at least until the scene you stated appears. Man I'm kinda sad.
Why are there still people who sympathize with Ecklis? Spoiler warning, the fucker is gonna attempt to rape Penelope. Hope this helps.