Somehow, the question is exactly what Jon expected, and nothing he expected to have to address, all wrapped up into one. He struggles to meet Martin's gaze.

"You were calling for me," He answers, vague. "You couldn't see me, and I'm... not sure that you could hear me all that well, either. You needed me, and to--- not be alone, and I couldn't let you be. Wouldn't let you be. I understood the cost."

Even without the aid of the Eye's knowledge, it's not hard to see that he's only skimmed the surface of it, so much more lying just below.