Upper panel: Blueshifted velocity evolution inferred using spextractor on early spectra of SN 2020ue (blue), SN 2020nlb (orange), as well as transitional SNe SN 2011iv (green) and SN 2007on (red). The grey line and shaded region represent the average trend from the 247 SN sample in Stahl et al. (2020), analysed using the same method. Lower panel: Evolution of the pEW of the Si II 5972 Å line compared to the average trend reported in Stahl et al. (2020).