Reconstructed orbital histories of the two high-velocity BSS candidates in the frame of NGC 188. The dashed lines show the backward-integrated trajectories over the last 5 Myr in a Plummer potential (M = 2180 M_⊙). The shaded gray circle represents the cluster’s half-mass radius (r_h ≈ 5.59 pc). Both stars originate from the deep core of the cluster (r < 1 pc), consistent with a dynamical ejection origin.