Sri,
the scenario is as follows:
1. The charts show an apparent ranged trade (defined by HORIZONTAL lines) such as rectangles, H&S, Inv H&S
2. The theory says that break of one side will lead to move equal to the height of the pattern (difference between upper & lower levels of the band) and the movement will be towards the direction of the break. Let's call this difference as "T" and direction of initial break as "D-1"
3. If the price does not move "T" points towards the direction of the break, retraces back into the band/rectangle, and then breaks the opposite level of the band (D-2) then this is called breakout/breakdown failure (as case may be).
4. I have observed that in case of such failures, the resulting movement would ideally be equal to twice the "T" in direction "D-2".
If the apparent band is 4395-4430, we know that it is worth 35pts in direction of initial break.
If 4395 breaksdown with proper filters/room, ideally it should go down till 4395-35 = 4360.
If the price pulls back even before 4360, and later breaks 4430, it should target twice the initial 35pts ( ie 70pts)
Thus, we get 4430+70=4500 target for breakdown failure.
USUALLY, the entire process will seem like a divergence with RSI or other indicator.
In the above mentioned data, the whole thing resulted in a +ve divergence in RSI chart, and can be seen in the chart
(PS: This is my personal observation, and I may be wrong)