Unprepared
Ryu nodded. This did, indeed, make the most sense. As he had said before, going forward in time wasn't a problem for powerful cultivators who were willing to give up an equivalent exchange of resources. In fact, it was also possible to slow time down to a crawl as well. What was impossible was going back in time. The paradoxes involved were impossible to resolve.
This was all to say that Ailsa's words were easily acceptable. If there was anything to raise an eyebrow about, it was that the universe was still in its infancy when the Fey were around, as were their cultivation methods. To deduce a formation capable of sending Sarriel so far into the future was an impressive feat beyond measure considering their poor foundations at the time.
But, as soon as Ryu had this thought, he grew skeptical. If they really were so primitive, where had Sarriel's technique come from? And, was it even right to think of them as primitive to begin with?