will vs erlking

"Someone had to keep an eye on me," I said. "You and Grevane and Corpsetaker all wanted the Erlking to be in town. It didn't matter to you who called him as long as someone did."
"And you were the only one with an interest in keeping him away," Cowl said. "All I needed to do was watch you and ensure that you did not actually trap the Erlking."
"And that's why you followed me," I said.
"It's one reason," he replied. "I think you might actually have done it, you know, had I not interrupted you. I was the only one of the three of us who thought you might succeed."


Dead Beat Chapter 34, Page 301