Belatedly, Sam realized that the dumb thing might have been asking who he was, rather than wanting a repetition of whom he was asking for. Oh, well, too late to do anything about that now. The wall was shimmering, deepening in shade and seeming to become more opaque. Presences were gathering at what he wanted to call the top of the wall, but: that didn’t make sense because the wall had no top; his sense was of defenders gathering at the battlements. They knew he was here.