Probably some futures player panicked and placedĀ a “sell at the market” order, and the last few shares or contracts had to go way down to somebody’s standing buy order.
Lets not forget years ago people were caught putting in big temporary sell orders to push the price down and then cancel the order before it closed, so they can buy the dip.
Besides that, Gold is the pituitary gland of the entire financial system. The leaders have been pushing for 2% inflation and if gold starts falling, they will have sweat on their upper lips.