A buddy told me that he thought the fuel shutoff gate on the levers could be triggered inadervently by the PIC reaching across for the flaps as the SIC idles the levers. Levers could push the PIC's foream down against the latches, latches somehow get activated, and the levers could then continue past idle to cutoff, assuming the SIC was somewhat aggressive with his power chop.

CRJ had a similar shutoff latch, but I don't recall anything like that ever happening. I think the CRJ latches had to be pulled up? Been a long time. Maybe a sleeve got caught?

I do remember that when I shut the engines down that I was meticulous about doing them deliberately and one at a time with a pause, to avoid developing any dangerous muscle memory that might bite me in the heat of the moment. After watching CA's grabbing both and shutting it all done in one smooth motion.