As someone who's part of the bearish vocal minority, I agree with aj's response that it's a view based on patterns. Traders are always going to interpret patterns differently, but the goal is always to be on the right side of what the market does. If NDX 1612 gets taken out on a closing basis, the right side of the market will be long. I personally though the C of this correction was done on Monday, but once we took out Monday's high on Thursday, I knew that wasn't true, so I could have turned short-term bullish right then and, from a trading perspective, I should have.