Board Thread:General Discussion/@comment-26006155-20190425222457/@comment-38339538-20190503001445

In the original Earthbound, teleportation works like a Delorian from back to the future. Once you go fast enough you teleport.If you run into anything, it cancels your teleportation.

Sans teleports us through the wall in the alleyway near MTT Diner, without getting a running start. He just walks normally towards the wall. If Sans was bound by Earthbound teleportation rules, he wouldn't have been able to get past that wall, as it would stop him from teleporting.