When someone calls a top or bottom, that's a prediction of inflection. That he called it a top merely reflected his bearish sentiment, the inflection was nevertheless a good call.
To assess the quality of a call/prediction, it helps to compare it with the opposite prediction. Consider two predictions:
1. Original one by volente: "S&P 500 has topped at 2430 or is within 22 points of doing so."
2. The opposite one: "S&P 500 has bottomed at 2430 or is within 22 points of doing so."
Looking at the chart, and noting that S&P 500 is now at 2470, it's quite clear that the second prediction would have been much better than the first one. Should someone have followed that second prediction, and bought at 2430 and 22 points below, he/she would be doing quite well.

