The project aims at understanding how rapid vorticity annihilation takes place across a sharp vortical interface over a wide range of Reynolds numbers. In order to exclude any influences of (convective) length scales from the flow scenarios under consideration, all investigations center around boundary layer development at the outer wall of rotating facilities. In continuation of the original thought experiment by Kriegseis et al. [1] on the impact of initial conditions, two distinct yet similar cases are contrasted to characterize the formation process. Particularly, development and annihilation of vorticity is directly compared between one case with an irrotational core and its corollary with opposite-signed vorticity across this interface. As such, the possible impact of initial conditions on the effect of rapidly changing boundary conditions can be uncovered.