  LIGO/Virgo S190814bv is the first high-probability neutron star - black hole
(NSBH) merger candidate, whose gravitational waves (GWs) triggered LIGO/Virgo
detectors at 21:10:39.012957 UT, 14 August 2019. It has a probability $>99\%$
of being an NSBH merger, with a low false alarm rate (FAR) of 1 per 1.559e+25
years. For an NSBH merger, electromagnetic counterparts (especially short
gamma-ray bursts (GRBs)) are generally expected. However, no electromagnetic
counterpart has been found in the extensive follow-up observing campaign. In
the present work, we propose a novel explanation to this null result. In our
scenario, LIGO/Virgo S190814bv is just a GW mirror image of the real NSBH
merger which should be detected before 14 September 2015, but at that time we
had no ability to detect its GW signals. The electromagnetic counterparts
associated with the real NSBH merger should be found in the archive data before
14 September 2015. In this work, we indeed find 9 short GRBs as the possible
electromagnetic counterparts.
