Modified this chart a little to graduate the individual data...

Modified this chart a little to graduate the individual data points relative to current 6 month average shorting volume.

The darker red the bar is the larger that days shorting volume % is above the average 6 month shorting volume %.

With the varying volume column length, this makes it easier to see where that stock/sector/market index's shorting has been heavier than usual.

It shows a period 71-89 days back where the market moved against the shorters.
And a hugely successful shorting run gathering steam from day 39 to 22.

FWIW.