Xu Huo immediately bought a close-range Spatial Teleportation Device from Beneath the Dimension, similar to a "Doorbell" as a one-time space-crossing prop, which connects to the nearest stable small space, providing the holder with a safe house. It's somewhat like the tools used by those two experimenters in Zone 017, though it only lasts ten seconds before automatically returning to its original position.
He didn't actually go inside; rather, he took advantage of the stable Space Portal opened by the prop to activate the Time Ray and Spatial Ray.
Once the portal was opened, as expected, both the time and spatial rays experienced some form of disconnection. This was likely because the small space created by the prop is extremely stable, allowing people to freely move in and out, but the interfaces between spaces weren't completely compatible. Thus, he couldn't directly control the rays inside the small space from outside, but he could once he reached inside.
