After earnings NASDAQ:SRPT tanked HARD to what was a prior support at 126.53 where I had entered back in September. I watched this closely with a residual positions to see if it would hold it or break the level. I wanted to have some skin in the game for SRPT to retest the highs for the long term. So far today it looks to be holding that level as it has retraced a full 50% of the post-earning drop.
Marking this up for posterity as a collection of examples for the 50% retracement levels being a powerful signal of Support and Resistance.