I'm fairly sure Xenolith affected the very concept of pain on Shiki, since he talks about about that immediately after.
Also, my theory about Xenolith speaking about dragging girls from the future is that Satan Gravity can passively predict the future and then affect it in order to keep Shiki alive.
Think of it, predicting that Shiki would have ended being shot by Drakken, Satan Gravity activate Rebecca's Cat Leaper in the future, effectively dragging her to the past by manipulating her own power, which is able to do that, and in this way Shiki was saved.
That may be a passive fatehax protection