'Sword'

Reading this John MacFarlane paper (on Frege, Kant and versions of 'logic'), I came across the following sentence:

By arguing that the Begriffsschrift fits a characterization of logic that Kant accepts, Frege could blunt one edge of Wang’s double-edged sword.

Philosophers, eh? In other news, 'Wang’s double-edged sword' is the name of my new band.