Gold gets sold in a market panic. Check 2008, gold sold off steadily throughout the year and collapsed 30% into the October/November crash phase.
Recalling other large declines.... Gold, just like now, having been touted as "insurance" against the decline, ended up not. Initially golds resisted the decline but soon "caught up" with the downside move. (I recall one time when the market puked and I was "wiping my brow, glad I was in golds" as they initially rallied against the down market. Unfortunately, didn't last long... and gold soon smashed too.)