@Ovdose I interpreted it as a corkscrew/slash + inertia combo. You can see some "sonic boom" like effects on Pure on page 11 so we know she is going fast. Coupled with her claws she could def do some major damage by going straight into the open wound Hitomi got on Sloth's neck.
This is cheap, I can't even blame Nodoka for Tasuku's death now. I mean, what was her fault, getting captured in the wild and then experimented on by retards with too much spare time and funds?