Board Thread:Naruto Discussions/@comment-31123919-20170123024706/@comment-9782468-20170123052213

@Lorenzo, Teleportation isn't light speed. It's instant. Light speed is fast, but it isn't close to instant.

Regarding the actual question, this show is made up of very illogical premises, idk why this one stuck out to you. But in any case, Sasuke probably used the Body Flicker to speed up his movements, and we already know he's got insane speed even as a kid. That's all I can give you; if that's not enough, then sorry. This show isn't very logical.