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AGN feedback during galaxy merger has been the most favoured model to explainblack hole-galaxy co-evolution. However, how the AGN-driven jet/wind/radiationis coupled with the gas of the merging galaxies, which leads to positivefeedback, momentarily enhanced star formation, and subsequently negativefeedback, a decline in star formation, is poorly understood. Only a few casesare known where the jet and companion galaxy interaction leads to minoroff-axis distortions in the jets and enhanced star formation in the gas-richminor companions. Here, we briefly report one extraordinary case, RAD12,discovered by RAD@home citizen science collaboratory, where for the first timea radio jet-driven bubble ~137 kpc is showing a symmetric reflection afterhitting the incoming galaxy which is not a gas-rich minor but a gas-poorearly-type galaxy in a major merger. Surprisingly, neither positive feedbacknor any radio lobe on the counter jet side, if any, is detected. It is puzzlingif RAD12 is a genuine one-sided jet or a case of radio lobe trapped, compressedand re-accelerated by shocks during the merger. This is the first imaging studyof RAD12 presenting follow-up with the GMRT, archival MeerKAT radio data andCFHT optical data.

RAD@home citizen science discovery of an AGN spewing a large unipolar radio bubble onto its merging companion galaxy