Liquid interfaces interacting with high-speed gas flows result in unsteady waves, atomization and countless applications. Here, we capture the intricate dynamics of a blast-induced air flow interacting with a liquid jet at the opening of a shock tube with a rectangular cross-section (aspect ratio 2:1). Features like a blast wave and the induced airflow rolling up to form a compressible vortex ring are observed using schlieren imaging. This decaying flow field, when imposed over the water jet interface, leads to a cascade of ripples with waves getting coarser in time. Furthermore, asymmetric airflow leads to a fishbone-like jet morphology with minimal dynamics when viewed from the shorter edge.
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