User blog comment:ARX07Arbalest/Safira, The Vengeful Spirit/@comment-88.152.79.14-20121211210354/@comment-4689979-20121212035737

the E is actually a more creative approach to nocturne's tether, while the ult is very similar to Zyra's ult and Vladimir's pool, though this one requires timing.

The W is inspired from Anub'seran's "Sukuchi" from DotA Allstars :)