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Good one.  The mind is designed to do what the herd does - it's a primitive survival thing.  So in discretionary trading, if the price rips/dips, you'll feel a pull to go in the same direction.  The degree of pull depends on how much you need to be part of the crowd, and that depends upon how free or tied up you are in your own mind.  If you are free of your mind (ie. not thinmking too much), then fear will be low and you'll make the right decision.  If not, you'll get whipsawed like nobody's business.

Even though it helps to know the herd is usually wrong, sometimes they are very, very right!  And as a trader, even knowing all your probabilities, you still don't know if the price is going to revert or not.  Maybe it will just keep on moving.  Maybe it will keep moving for days on end.  All the offline work in the world (drawing levels, lines, contingencies, stops etc) won't save you if you are tied to your mind around the time of placing the trade and when in the trade.

Ideally, you train yourself both in thinking and the stopping of thinking.  Thinking should be done offline: to figure out probabilities, perform backtests, understand human nature and potential edges, where to place levels etc.  Non-thinking is done online: to get in tune with the flow and feel of the market, place and manage the trade with some degree of regard to your levels/stops etc, but not in too rigid a manner.  Skilled, non-thinking dsicretionary trading beats logic and systematized trading any day of the week... it's just that it's much harder to do.