Since 1927 there have been 107x the $SPX has returned more than 30% in a 52 trading day period. Of those, 102 were ALL STILL AT LEAST 42% below previous SPX high AFTER THE 30% RUN. The other 5 were 
10/20/82
10/21/82
10/22/82
10/26/82
10/27/82
The range was 1-4% below high.