Sort of interesting he seemingly isn't going after Sinon right now, unless what's happening in this episode is only theater and he knows Kirito & Sinon are watching, like I said earlier. Another interesting thing is that if you watch until 21:57 of that same ep 3, another picture has appeared right of Sinon's, though it's not shown fully, so it's a mystery who's that target. It's not just reordering of the same three, though, but a new one. So, he does have more targets preselected, possibly as many as we saw shadows behind the three clear cards at 21:45. He might also not be overly methodological, and those photos could be merely any people he thought interesting at any point, even if not in a lethal manner.