Quote Originally Posted by chet_chetty
Speculation on how Sasuke uses Oro's snake jutsu(s).

1. copied using sharingan
2. taught by Oro
3. possible access to Oro's (bloodline-type) jutsus via curse seal and/or Oro's existence in the ritual dimension/Sasuke's subconscious
Probably a combination of 1 and 2.

Anko's used hidden snake hands before, so it can't be a bloodlimit or anything too fancy.