(Because it's so much more simple, I'm assuming that this is after Elsa spoke to Brennan and found out she's a mage, hope that's ok. =))
The night air was cold, her heart was cold, and those and many other things almost made her angry enough to be irritated at the large man who had been watching the last few hours. She knew now, after having spoken to Brennan, what she was, but it was not enough to bat away the annoyance at being followed. Perhaps, if things had been different, if she had not just taken part in a battle, her meek demeanour would have asserted itself. But right now her heart was cold, though her soul was burning with the memory of magic, and it made her fierce and angry and proud. Right now was also the moment that the slight female soldier - her jailor - choose to reappear. As she sat down, Elsa straightened her back even more, her chin lifting and her eyes doing a subtle dance as she took in all she could see of the girl. When she sat down she was small enough for a child, and for a moment, one confusing, shining moment, Elsa knew she had been in a similar situation, conversing like this with a young woman. She waited, longed for a memory to accompany the realisation, but none came, and it saddened her, bringing a slight flush to her cheeks.
"I did not know he was for company," she answered, forgoing any polite greeting. "I was under the impression that he was my jailor..." Resting her hands demurely on her lap, she stared straight ahead of her, even though there were little to look at in the dark. The pleasant introduction, Elsa ignored altogether, only lifting her chin a little higher still, her hands clenching once in her lap before relaxing. They might have worked like a team when the battle raged, but Elsa had little trust for a girl who dressed like a man and fought like one, and who took steps to restrict her freedom.