I'm not a chemist, but is there any way that a poorly mixed batch of priming compound could have something in it that makes it way too sensitive?
I suppose ice could have prevented the hammer from dropping all the way when he decocked it. The ice might then shatter when it starts to warm up and let the hammer drop the rest of the way. The round in question was found to have a high primer; maybe the hammer falling pushed the slide forward and caused a slam fire without dimpling the primer.
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