Bob Farrell says that a bear market goes from caution to concern to capitulation. Bear markets tend to bring bad news in one form or another, regardless of their shape. Triangles, for instance, are seemingly moderate sideways patterns. Yet there is almost always a scary event or point of focus in wave e, the last wave, that keeps you out of the next advance. In a large bear market, wave e of an upward triangle correction usually features a bullish event that gets you to buy just before the rug is pulled.
Bull markets do it again, only the other way around.
They save the best news for last. In real time, the Wave Principle is a lot more complicated than it sounds when you simply describe the types of waves. Dealing with corrections is particularly difficult. Five-stage movements are generally uniform, with very few exceptions to the rule. When prices are moving with the trend, they are moving very freely, and you get the full five-wave structure.