Probably the easiest explanation is that it would be going against the sector movement but there are other things involved also. Thus if the sector is rising and there is a sell signal given by the changes in the pink and green on the chart then I would say that would be a risky bet as you are going against the sector.
If the sector is going up and you get a change to green on the chart I assume that would be a good thing and call that confirmed. It is a bit more complicated than that but you can probably get the idea.
BND Price at posting:
21.5¢ Sentiment: None Disclosure: Not Held