Closest distance to the LMC and velocity at closest approach for the S3 BHB (BS) stars from N19, represented by white points (squares). The magenta line is the escape velocity curve of the LMC for a Hernquist sphere with M_LMC = 1.25 × 10¹¹M_⊙ and r_s,LMC = 14.9 kpc. Any stars above the magenta line are likely not bound to the LMC. One BS has a close approach (~3 kpc) and a relatively low velocity with respect to the LMC (~330 km s⁻¹). The other two BS stars are closer in distance and velocity to the LMC than most other BHB stars. However, if the BS stars were misclassified BHB stars (grey squares), they would be among the most distant stars with the highest velocity offsets. This suggests, independently of the stream models, that S3 is not of LMC origin.