Board Thread:General Discussion/@comment-27907368-20160412010659/@comment-25181180-20160424112612

Sans' teleporting ability is already known even before his fight.

An example of these is him appearing twice at the same room in the Snowdin Forest. Specifically, it's the room where Gyftrot first spawns. Doggo also said "I hate Sans. He likes to appear without moving" when talked to in Grillby's. Calling Papyrus and Undyne at Sans' Hotland station will make Undyne wonder how he can keep pace by guarding two stations at once.