Zoom-in of the spectral region around the He I (10 833 Å) triplet. The velocity is measured with respect to 1.0833 μm. The same spectral region of He I profile of an RCB star is shown in red – RCB-ToI-223 (a.k.a. WISE J182010.96−193453.4), at a phase when it has just emerged from a dust decline. We cannot resolve the contribution from the Si I line to any He I features from our low resolution spectra. However, it is evident that we do not detect any strong (> 200 km s⁻¹), RCB-like winds in any dLHdC star, suggesting that there are no dust-driven winds around them. This is consistent with no hot dust excesses seen in the SEDs of any of these stars. A166 is the only dLHdC star that shows a possible high velocity He I absorption profile (plotted in blue).