Velocity profile at the onset of core-collapse for a 50 M_⊙ He core, which undergoes a PPI mass-loss event while collapsing. The dashed red line shows the escape velocity profile, the thick blue line indicates the profile of the bound material, while the thinner line represents material still on the Lagrangian mass grid, but already beyond the escape velocity. The gray area indicates the model dependent amount of mass lost to stellar winds.