i dont think haku was teleporting i think he was jus moving at a high speed and when you saw him in all the mirrors i believe it was an reflection of his real self projected on the other mirrors
hey we all know kakashi said he couldnt copy haku's ice jutsu (water and wind) but in the first me in the snow country he copied an ice jutsu. The guy did a ice one horn whale and kakashi copied please explain how he did that.