It’s very simple. If the gun has a “hair trigger” it is entirely possible for someone to activate it without deliberately pulling the trigger
Also, IF Baldwin was trying to execute a draw with some speed, then he MAY have mistakenly or inadvertently used his trigger finger to assist in gripping the revolver, because it's harder to get a fast and secure grip with just your other four fingers and thumb.
If he WAS using his trigger finger to help grip the the revolver, and if he thumbed back the hammer WHILE the trigger was pressed, the hammer would have dropped and the firearm would have discharged the instant his thumb came off the hammer.
If he was practicing cross-draw at the time (as indicated in some reports), this not only complicates quickly getting that initial grip but also results in the muzzle potentially swinging across a large horizontal arc during the draw, with an accidental discharge potentially occurring anywhere along that arc.
I remember being taught by a retired Marine Corps firearms instructor, who happened to be the man who raised me, that single-action revolvers have a considerably higher incidence of accidental discharge than either double-action revolvers or semi-automatic pistols. Especially when someone attempts a quick draw - that's when a rather critical sequence of events can be disrupted.
(Imo NONE of the above addresses the central issue, which is that Baldwin was handed a pistol which he had every reason to believe was safe for him to use, and obviously such was not the case because multiple protocols which have been in place and working effectively for decades had been violated.)
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