Since each two points define a line, a strong line should touch three price reversal points. In such a case, a fourth reversal point is anticipated to touch that line, too. Let this one be the first experimental rule.
Today's final move down disregarded the support, so further downward action is anticipated in short term. If the price jumps from the base , I'll buy.
(Well, actually, I will buy regardless of that condition, but here I'm pretending as if I solely rely on those lines.)