No blood is due to the censors. In the manga there is ALOT of blood when Haku is hit by chidori.Originally posted by: Knives122
Its really hard to see what the chidori really does, IMO after watching what happened to Haku and all the times Sasuke used it, it looks like the Chidori is designed to(after it hits its target) make what ever it hits explode, When Kakashi did it to Haku you saw no blood on haku, it looked like it made the heart explode, IMO that what it does