When you are forced into claiming "psychological", your position Immediately becomes DOA.
You don't think being startled by supersonic "crack" and a nearly simultaneous muzzle blast in a virtual echo chamber could have an effect on how one perceives and, more importantly, remembers the same loud sounds which come unexpectedly (at least regarding the second shot) about six and eleven seconds later, respectively, muddled as they were with
their own reports, echoes and reverberations ... and, finally, all-too-human sounds of shock and disbelief?
-- MWT

PS Speaking of psychological, how's your buddy Donald Trump doing today? Still aceing those "What day comes after Tuesday" cognitive exams?