"No. No, I'm not delusional. Lysa, although the older sister, was much more rash and impulsive than I was. Well, maybe rash isn't the right word, just...passionate. She allowed her emotions to control her way too often, but that also allowed her to get familiar with the concept of emotion and how to manipulate others to her cause." He chuckled slightly.
"She did that to me too many times to count. We'd be arguing about who knows what and then within a few moments I found myself convicted of her rightness. She used to say that it was her 'big sister' privileges to know how to control me." Shaking his head, he leaned back against the hard metallic seat. 
"It got worse when we were made Knights. She argued with the Council, her Masters and anyone else who tried to tell her what to do. She was a loose cannon in the field and got a couple of Republic troopers killed because she was too busy trying to kill a sniper who had nicked her leg while she wasn't looking. So, I guess it wasn't a surprise that she went over to the Sith. Their principles fell more in line with what she believed in." His eyes met hers. 
"The shock of seeing her dead probably made me feel nostalgic and...well, you killed her, so I assumed that it was because she was in the middle of some noble purpose." He swallowed.
"It's hard to think that she would fall that far, but, in a way, I suppose it would be better for her to die attempting to pursue her own destiny than be told by the Masters that she HAD to believe in a certain code." What he had just said would have earned him several fierce glares from the Masters that he regularly interacted with along with a scolding that "all must follow the path of the Light". He wouldn't discuss his somewhat radical views with Aria at the moment, however. She was his prisoner, although from the recent attack, she might have come a bit more willingly than before. 

Speaking of attacks...

"Who were those people that ambushed you? Were they after the same thing you were? I think the Zabrak mentioned something about a Lord Bracknell, a name that's come up a lot in the field."