Have a look at this trend channel on the Nazz, coming to us via Chart of the Day; Note that the trend dates back to the pre-election low in August 2004:
Whenever a trend line or support gets broken, experience teaches us that there is a very short window for trading to get back over that prior support.
Note this trend line break is NOT what I have previously referred to as a Wyckoff Spring — which is a test of support at a low, and not a trendline in a channel . . .