This chapter may not seem very sympathetic to Cullen - I do quite like the character, but imagine how a deeply templar-phobic mage would react to his request to kill all mages in the Tower.
Boundaries
Morgana
The others look at her in surprise when the first thing she does after waking up is to gently close Niall's eyes. She sees them, and explains, "My teacher." She swallows, adding in a low voice, "My friend." She almost can't bring herself to disturb the body, but they need the Litany.
Knowing he wouldn't have wanted it, she shakes her head when Leliana moves to pray for him, instead laying a hand upon his cold forehead before standing and looking to her companions. Alistair looks like he's about to say something, but she shakes her head again, and they move on, leaving one more aspect of her old life behind.
Her first instinct when she sees the templar, on hands and knees and sobbing into the ground, in the magical cage, is pity, even knowing what he is.
Then she looks at the walls of the Tower around them, remembers what Alistair said about the Chantry, and realizes that he's probably been in a cage since he was a child.
This is just a visible one.
He's ranting, half-crazed, and she catches things about blood mages, demons, tricks, but they make little sense.
She crouches to take a closer look, knowing he won't be able to get out, and recognises him.
Oh, Cullen. She remembers him, the templar who could never look anyone in the eye - though foolish apprentices had said it was just her - and had a permanent stutter. She'd briefly said hello to him a few times, knowing he was a templar and quick to get to her friends. She knew the templars used to treat him badly, knew there were rumours about... about him and herself, but hadn't really paid any attention.
She looks up, surprised, as he starts talking about temptation, a woman, a mage... She has to stop herself gaping in surprise. But he's a templar...
Then it becomes obvious who the mage he's talking about is, and she backs away in horror, because this can't be true, he's a templar, and she's a mage, and there are boundaries, and they don't even view mages as equals, never mind as anything else, because if it's true she's been wrong about so much...
A hand on her shoulder, an attempted touch of reassurance, and she looks away from Cullen, expecting to see Leliana at her side, but it's Alistair who gives her a nod, face set, taking his hand away, and she knows she has to go back to that terrible shimmering cage.
Even Alistair looks horrified as Cullen tells them to kill the mages, kill them all.
She shakes her head. Never. "We will free everyone... including the mages."
She looks at this broken monster as he condemns her, and she wonders how he could ever have loved her.