NDX100 'marks' the High (end of rally)?.......

NDX100 Daily Close @ 08/23/2102

If we are to use the NDX100 as THE 'Risk- On' measure (& who doesn't?);
then the Outside Down Day registered Tuesday does give us the 1st Tactical Sign that this rally is probably 'done'.
If so then the simple 38% retrace, coincident with 2x's previous highs circa 2665 shall be our first 'port of call' on any retrace.
"Engine room............"