With each passing second, Mara was further convinced that there would be need for a physical encounter in this situation. But oh she was trying to talk him away from the Dark side. She well knew the allure of it, the call it had. And she wasn't about to let Galen fall, not after how she'd been training him here. The last thing any of them needed was a Sith Apprentice running around killing. And if Mara didn't stop him here, then anything he did would be on her head as well. Still, even as he drew his lightsaber, she made no move to draw her own.
The mutter worried her. The tone was too dark for her liking and every sense in her body was on high alert. She was ready for him to try and attack her. At least if he attacked her, it would keep him away from killing out of anger. While Mara didn't exactly see much wrong with killing Moriarty's men, it was the killing in anger that she objected to. So it was keeping Galen occupied with her until he either calmed down or she had to knock him out herself. Which should would do if he attacked.
Upon seeing she'd made a correct assumption, Mara decided to press the matter further. "Is your anger related to Gaia in a different way?" She was stretching there, but considering he'd mentioned Gaia and his hatred of what Moriarty had made her do, it wasn't exactly that much of a stretch for her to make. His response, even if not spoken, would give her answer enough. But even as she could read Galen, she kept the expression on her face and body language completely neutral.