Harry, Marcus thought. He doesn't know the truth about Harry.
Looking wide-eyed at Ginny, Marcus wondered if she was really offering to remove that information from his mind, for his own safety, of course. He couldn't imagine Adrian ever letting go of anything of his own accord. But... the danger was apparent, considering the company Adrian was forced to keep.
"Are you sure about this Adrian?" Let him think Marcus was referring to their previous discussion of his own metal state. At least it would give Adrian an out if he needed it.