Or it might just be that the volatility index surged to an unprecedented 75, indicating a relief rally was imminent. Short term moves do not indicate very much and it will seen over the months and years whether or not any of the "necessary moves" had a positive impact.
If I've got my numbers correct, yesterday's rally was the fifth highest, percentage-wise in market history. Most of the higher percentage one-day rallies made their debut at the beginning of the great depression. Yesterday's move was not in good company.