once second dot and second arrow appears, wait for red(blue) candle and red(blue) background of xu ma v3  indicator to confirm the signal as entry  sell or entry buy

semafor helps to see higher top and higher bottom and lower top and lower  bottom pattern,

second dot is failure to make new higher top or new lower bottom, from there things changes the trend.

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analyse second dot in all timeframes
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now for example,

for an uptrend,(where basic is higher top and higher  bottom)

say H1 second dot appears, this will mark higher bottom in H1 (provided higher timeframes like D1,H4 are also displaying higher top and higher bottom with 2nd dot in this timeframes)

now H1 candle and background turns blue ( that means now moving averages are also lining up along with 2nd dot too)

now with H1 blue candle and blue background, on M15 chart 2nd dot(aqua color) appears then this is higher bottom in M15 with already higher bottom in H1, and now h1 background and candle blue, so it is a buy( both moving averages and higher top and higher bottom pattern is lined up)(no doubt market is going up )

now again down to M5 ( we have blue background of M15 with blue candle of M15)( that is where your mtf display of H1 background on M15 , M15 background on M5.......like this is all important)

now on M5 2nd aqua dot appears, ( now there is higher 2nd dot=higher bottom on H1, higher 2nd dot=higher bottom on M15 with blue background on H1, and blue backgroung on M15)

so this 2nd aqua dot on M5 is buy again, (market is going up again with higher top and higher bottom patern still intact in H1, M15 and M5)

so keeping three timeframes open(H1,M15,M5) with above templet and your 2nd dot will provide entry points. 

in these scenario orange 2nd dots that appear as higher top are no action one ( or at best exit points) as again retracement counter to up trend will follow.( as primary trend is higher top and higher bottom)

reverse is for downtrend.