Not trying to let the guy off, but a couple things stand out to me. One, it was 9:30 pm and they were outdoors; it must have been nearly dark, certainly after sunset. Two, the guest did try to clear the gun, and clearly thought he had.
Yes, he should have been much more careful about where he had it pointed, and he could have tried to lower the hammer in a way other than merely pulling the trigger - or left it slide-locked.
A tragedy none of them will ever forget, to be sure.
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