Hα line of the +49 d Keck-I/LRIS spectrum of SN 2018ivc published by B20. The rest-frame Hα wavelength is marked and coincides with the narrow Hα emission with a narrow P Cygni profile. The HV feature at 6400 Å is visible on the left side (see Sect. 5.2). A 2m Faulkes/FLOYDS spectrum taken the day before the Keck-I one, also reported in B20, already shows the narrow absorption feature. Our lower-resolution spectra taken near that phase are also shown, in which a ‘small’ emission feature is visible at rest-frame zero velocity. A zoom on the P Cygni feature in the Keck spectrum is plotted in the blow-up box.