The massive evolved Wolf-Rayet stars sometimes occur in colliding-wind binary systems in which dust plumes are formed as a result of the collision of stellar winds \citep 2007ARA Align A..45..177C .
These structures are known to encode the parameters of the binary orbit and winds \citep 1999Natur.398..487T,1999ApJ…525L..97M , tuthill2008 .
Here , we report observations of a previously undiscovered Wolf-Rayet system , 2XMM J160050.7–514245 , with a spectroscopically determined wind speed of \approx 3400 km s ^ { -1 } .
In the thermal infrared , the system is adorned with a prominent \approx 12 ^ { \prime \prime } spiral dust plume , revealed by proper motion studies to be expanding at only \approx 570 km s ^ { -1 } .
As the dust and gas appear coeval , these observations are inconsistent with existing models of the dynamics of such colliding wind systems \citep 2002MNRAS.329..897H,2015MNRAS.450.2551M,2017ApJ…835L..31L .
We propose that this contradiction can be resolved if the system is capable of launching extremely anisotropic winds .
Near-critical stellar rotation is known to drive such winds \citep 2004A Align A…418..639A , deMink2013 , suggesting this Wolf-Rayet system as a potential Galactic progenitor system for long-duration gamma-ray bursts .