Recent articles quote: ""Since 1950 there has never been a bear market rally that exceeded the 50% retracement and then gone on to make new cycle lows," said Jonathan Krinsky, chief market technician at BTIG, in a note earlier this month."
Krinsky used a chart and looked for .5 retraces after the completed drops and didn't look for retraces that occurred after just the 20% drop needed to be classified as a bear drop.
most of the bear drops had .5 or a bit more retraces after the 20% level and most went on to lower levels. I put in 10 minutes and found several 1980ish, 2000 was a point shy, 2008 and I'm sure there were more.
if it looks right it is right