For a human, she actually wasn't too bad. As they fought their way to the forward camp, and then through the mountain pass toward what remained of the Temple of Sacred Ashes, he slowly came to the opinion that if a human absolutely had to have control of his magic, this human wasn't such a bad choice.
He had spent enough time studying these humans to know that they did not look kindly on either mages or magic. Even those who weren't actively involved in condemning magic and imprisoning mages had so little true knowledge of magic as to be nearly useless. It was as something of a test, therefore, that he cast his barrier around her as they fought demons on their way to the forward camp.
She turned a startled glance on him as the barrier flickered over her with a slight tingle, but quickly turned back to the fight. Afterwards, she simply nodded her thanks, and moved on. He couldn't help but be impressed by her casual acceptance of his assistance.
She proved to be rather adaptable in any number of surprising ways, actually. She was quite skilled in her chosen form of combat, and seemed to quickly grasp the tactics involved in leading a mixed team; he directions to them as they entered battle - and occasionally the warnings yelled during a battle - were always effective.
She didn't seem to have any trouble accepting the Seeker's changing opinion of her, his own taciturn silence, or Varric's irreverent commentary. She was equally undisturbed by Roderick's anger, when they finally reached the forward camp.
She accepted the necessity and responsibility of closing the rift at the Temple with the same calm demeanor that she used when suddenly called upon for a decision by her former captors.
In all, where he had expected that she would be so bewildered by her circumstances as to be mostly useless, she was turning out to be not only fully capable of coping but willing and able to do so.
He wasn't sure if this was a positive development, or if it would make his goal more difficult to accomplish. Where a bewildered wielder would have allowed him to step in and provide the control - or, rather, guidance - that he wished to exert to make sure that things worked out the way he wanted them to, he couldn't help but be impressed by her. What was more, he was slowly wrapping his mind around the idea that if she didn't need to be dragged toward his goal but might go willing - even eagerly - it might make things easier for him in the long run. Instead of brute force and constant, tiring shepherding - never his strong suit - he could simply let her pursue their goal with minimal direction, and a few slightly misleading bits of information.
By the time they reached the Temple ruins, he was nearly reconciled to this new plan, and feeling rather smug about it. It wasn't until the pride demon knocked her off her feet with a casual swipe of its arm, that he began to suspect there might be a glaring flaw in this new plan.
If she died, what would happen to the anchor? He didn't know enough about it to be certain whether or not it would continue to exist if she was no longer alive. He knew that it was bound to her, he knew that even he could not pry it away from her, but what precisely was it tied to? Her physical form? Her life force? Something else entirely?
He hadn't thought to test that aspect of it, since he had no way of doing so without harming her, which would sit well with her captors and wasn't necessary until he knew more about the situation.
Fortunately, she was fine, and aside from ensuring that he was always close enough to her to keep her encased in his barrier, he didn't worry about the question again until after the fight was over.
He had quite a bit of time to ponder this question following the battle, while the prisoner - now called the Herald of Andraste, and wasn't that an irony that made him want to snarl at everyone who spoke the phrase - lay unconscious in Haven.
By the time she awoke, he was no closer to an answer.
It hardly mattered, though. She was looked upon as a hero by all, and as a divine messenger by some, and even if he had wanted to test the anchor further, his chance was gone. He had no choice but to follow along as she charged down a path not of his making, and hope that he could influence her just enough to make sure that their goals were mutually attainable.