As usual, Alex figured it out without requiring excessive specific evidence. Simon was trying to hold back, to the best of his abilities, and doing so was absolutely exhausting. Still, far be it for him to refuse Alex when she needed some answers. That's the one thing he's been fairly consistent in offering her, answers when all other leads ran out.

So here they were. And of course, Simon wasn't going to let her dance around the topic. Did she expect that he would? She knew better than that. He'd always jump to the point and pressure her to ask what she was avoiding. Maybe she should just bring a recorder to comfort herself? Her nervousness was noted, but there wasn't much Simon could offer in comforting words. Only an unfortunate confirmation:

"You've always been able to see them."