=============
LINES REMOVED
=============

Sebastian: "I swear to you, I will kill him!"
Sebastian: "And you went along with him!"
Sebastian: "You were... part of this?"
Sebastian: "But what of Anders?"
(god Seb you're mad we get it but we're debating whether to side with the templars or mages in a bloody conflict right now)
Sebastian: "Your first act must be to execute this traitor."
Sebastian: "He should be killed on the spot. With the templars busy, there is no one who can contain him until a trial."
Sebastian: "No! You cannot let this abomination walk free. He dies, or I am returning to Starkhaven."
Sebastian: "And I will bring such an army with me on my return that there'll be nothing left of Kirkwall for these maleficarum to rule!"
(yikes)
Sebastian: "I gave up on Starkhaven to serve the Maker, but He has turned his back on Kirkwall for harboring heretics like this."
Sebastian: "I will not fight you, Hawke. My death now would serve nothing."
Sebastian: "I will return to Starkhaven. But..."
Sebastian: "I swear to you, I will come back and find your precious Anders. I will teach him what true justice is!"
(yiikes)
Anders: "Thank you for my life. I'll try not to make such a mess of it this time."
(above line doesn't play if Seb is not present and it's so dire-sounding I just removed it completely)

===============
LINES PRESERVED
===============

Sebastian: "Why are we debating the Right of Annulment when the monster who did this is right here?"
(above is the only line that will play under all circumstances, in the debate before Hawke is forced to choose a side)
Sebastian: "This? This is what you tried to trick me into doing?"
Sebastian: "Elthina is not the Circle! She was a good woman, and you murdered her!"
(above two lines only play if Elthina was distracted in the act 3 Justice quest and you ask Anders about it (and for the first, only if Seb was present, I think?))
Sebastian: "Do not hide behind your spirit! It was <emp>your</emp> hand that did this."
(above line only plays if Anders is at 100% rivalry)
Sebastian: "If I'd been in that chantry today, would you be waffling? You know what must be done!"
(above line only plays if followers are asked for their opinion)

(following exchange only plays if Hawke tells Anders to leave or to side with the mages, and Seb is at 100% friendship or rivalry)
Sebastian: "You condone this? The brutal death of an innocent woman of faith? Someone you knew! Who trusted you!"
Sebastian: "I thought I knew you, Hawke."
(above line follows up if Seb is at 100% friendship)
Sebastian: "You're the one who taught me that it is the ends that matter, not the steps you take to get there."
(above line follows up if Seb is at 100% rivalry)
Hawke Dialogue Wheel: "Do not interfere, Sebastian."
Hawke Dialogue Wheel: "He's right. The grand cleric deserves justice."

Sebastian: "It will never be enough, but it's a start."
(above line plays if Anders is killed or convinced to side with the templars (reasoning for latter: Anders expresses his intentions to "stop this war before it's too late"))