Left panel: density maps obtained from a hydrodynamic simulation of the interaction between the jet and the penetrating bubble. Three snapshots are taken ∼0.4, 400 and 950 yr after penetration to illustrate bubble evolution. Right panels: bubble Lorentz factor/bubble radius as a function of jet height as calculated through the analytical estimate (dotted line) of Barkov et al. (2010, 2012), used to derive all results presented in this work, and compared to those obtained through our simulations (solid line).