It was the issue of hearing protection in particular that made me suppose there were indeed other firearms than the 1911 involved,
I can tell you the last thing in the world you were worried about was hearing protection. You'll didn't hear the gun going off anyway. Other things to think about and I'm not too asshamed to admit, being scared S*** Less was number one.
But thinking back on it, I would suspect the soft mud would soak up much of the muzzle blast.