Magnifico 02 Feb 2019 01:37
One way to learn this is to be Etheric with the bone pistol equipped and have Flying Teeth follow an etheric technique. But I just learned it (while Etheric) in a fight where I didn't use any buy my opponent did:
You set your stance and prepare to block.
The rat raises up its hands and a massive arm forms from nearby garbage. The arm crashes down on you for 3 etheric damage.You dive for cover.
A tooth-like fragment of your gun sinks into the rat hungrily for 29 ranged damage.
You fire a heavy round at the rat for 27 ranged damage.
EDIT: And just now got it in a fight where neither my opponent nor I used any etheric techs. Might just be for fighting with the bone pistol and using Flying Teeth, period.