It's a correction, right? Just like August.
That was last week's conventional wisdom, and that was before the S&P 500's downdraft drove it 10 percent off its highs and wiped away 6.2 percent since the year began.
The velocity and pain of the move, however, has more than a few market pros questioning whether the sell-off is really the start of a new bear market.
Jason Hunter, technical analyst at JPMorgan, provided some insight on how to tell the difference between a bull market correction and the start of a bear market.