Top row: Trailed spectra of TIC 378898110 from 2021 July 05, created using 49 back-to-back, one-minute exposures with Goodman + SOAR, phase-folded on the 23.07 min period and showing the 4387.9 and 4471.5 Å He i lines (left and right, respectively). Bottom row: The same trailed spectra with the mean spectrum (Fig. 10) subtracted from each. We do not see any periodic feature in the residuals.