That gave Spike some pause. He understood next to nothing about who or what this Mistress was, only what little he found out from Twilight, who was told by Celestia. He only knew she was bad news, and the human was tied up with her in some way. Now he knew that whoever she was, she had a full-fledged ancient dragon on her payroll, and that was all sorts of bad news for everypony. He swallowed and steadied himself. He had to know, whatever the expense to himself. Standing his ground, he looked her in the eyes and did not blink.