(1)The straight down time forming the rod is hard to enter because you do not know where the bottom is. You could make big money if you are very quick to short heavily, but it is super difficult. If you short late and do not cover soon after the bouncing of flag, your gains from short can be wiped quite soon.
(2)The flag range move entry is also hard, because you do not know the top and bottom of the flag in advance. However, some TA master can do buy low sell high trick several times there.
(3)Once you figure out the flag pattern, entry point is clear and operation becomes so easy: draw the flag from TA graph and wait for the break down point to start short and hold until the target comes.