Sorry, just saw your response now.
Yes, the pre-Franky was down yesterday (today as well), and Frankfurt opened below the overnight range. So, you should look for a short on the pullback of the range low.
But sometimes, the risk with the follow signal is that you are risking too much, when you chase the trend. Because let's assume that you short the low, but the pullback is deeper & it stops you out.
I look at Franky & pre-Franky as a fade trade mostly, on a fakeout. The risk is extremely low on most days.
For example, see the attached chart. Two things could happen.
a. The overnight range low broke, it follows the downtrend.
b. The overnight range low broke, but it turns out to be a false break of the low. In those cases, you generally get a faster momentum on the other side.
Today is another example.
a. The overnight range low was broken by pre-Franky. If you consider fakeout, then you would look for a false break, like I was today.
b. Or if you assume the break is the trend, you would look for a pullback of the break to go short.