Never heard anything like this happen before. The only thing I can think of is possible false neutral and it popped down to 1st unexpectedly and surprised him. This would be caused by a weak shift to 2nd that usually is ok until throttle is released and then it'll pop down a gear.
For new riders, I think its mostly things that startle them over things that are actually wrong with the bike.
BUT to be honest. Not to be mean or anything but I call BS. It is much easier to blame something wrong with the bike than take responsibility for a poor decision while riding. We'll need more info on the damages and a better explanation from your GF's brother to make a more accurate prediction on what happened.
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