"Unless thou hast the ability to read another's thoughts, there is no way to guess one's intentions." Which was a point in Loki's favor, since his own intentions were rarely pure in nature. "But one may hone their instincts, to make reasonable guesses. A skill, which again, takes time and practice.
"A woman?" Loki's interest piqued, then explained, "Once thou hast familiarized thyself with the ways of sorcery, it becomes easier to detect the ability in others." This was how Loki knew that Billy had a lot of potential. He was interested in what Billy revealed, for ever since he'd been cast from Asgard, he was curious to learn more about those who knew and practiced magic in Midgard, to find out who his enemies might be, his allies, their strengths and weaknesses. "Dost thou still have her card? What was her name?"