Proper motion of the identified BHB stars (stars) in comparison to the simulation data by Dierickx & Loeb (2017) (point markers) and Vasiliev et al. (2021) (square and plus markers showing rescaled proper motions by 1/f , where f is the same factor used to rescale the heliocentric distances of the simulation data, i.e. 1.11 ± 0.02; we note that the uncertainties in the rescaled proper motions resulting from the uncertainty in f are smaller than the symbol size) and the globular cluster NGC 2419 (filled circle). We show the predicted motion along right ascension and declination in the simulations across the same angular range of the stream as the BHB stars cover. The proper motion estimates of NGC 2419 correspond to the values provided by Vasiliev & Baumgardt (2021).