J201633 FEROS spectra covering Hα emission wavelengths. The dashed line highlights the predicted position of the Hα emission line given the measured RV of the M0.0 primary. No emission is visible at this position. However, emission lines are observed shifted to the blue and red of this position. This suggests the M0.0 primary is no longer active because the system is old whilst the M2.0 secondary is an unresolved synchronized pair which is active due to tidal spin-up, resulting in Hα emission shifted according to the RV of the individual components.