If I were always scanning the stock market it would have been really obvious to see this drop occur by means of the Traders Dynamic Indicator.
Note
On 12 Hour chart RSI creeped out of VB hi.Note
Weekly Chart 
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Disclaimer
The information and publications are not meant to be, and do not constitute, financial, investment, trading, or other types of advice or recommendations supplied or endorsed by TradingView. Read more in the Terms of Use.