Which was also why he wasn't currently dead. A new dimension, and this woman having the ability, and intelligence, to keep him alive. She was resourceful, and Vader took a moment to note that. Her lack of fear in him would make her a good ally, but not necessarily a good servant. He figured, though, that her lack of fear resulted simply in not knowing him all that well.
When she mentioned that others feared him, a quiet moment overtook the Dark Jedi. He felt, for a moment, the hollow pang in his heart that had begun to take a stronger hold ever since he'd met his son. A feeling that had been in him since he'd turned, helping to kill Mace Windu, destroy the Jedi, and when he'd killed his wife. The guilt had, probably, always been there he supposed. The problem being, of course, the Dark Side and his anger had always overruled it. Now, it was almost as loud.
Still, the emotions were kept to himself, thankful once again for a suit that hid his features from those around him. He was currently in an unknown situation, it was best to keep all his cards close to his chest, "They are wise to fear me, I have done plenty to warrant that fear." Whether he was bragging or shameful, was hard to tell in the deep, robotic voice of the helmet.
"What do I call you?" He offered, looking to her, "You are part of the medical team?"