I would consider to buy calls at that time, right at the LOD signal, not even waiting for the ADX to turn down a bit as confirmation. This will result in better price entry (due to panic selling)... when it's wrong, you will know when the support close to LOD is breaking.
Remember when INDU has a 200 points day, the HOD and LOD signal would be invalid.
From the above statement, if a gap down then sell off for 200 points in early morning then you see a LOD signal, you should buy that signal. On the other hand, if we gap down 100 points, you see the LOD signal, then the INDU support got broken. You will know that we have an invalid signal, it implies that INDU will drop 200 points. What you can do is to get more Puts because we still have 100 points to go down... or short some DIA.