There is so much stuff in the Dark pools to think about that is faster than the human melon can handle at times . Distance from the exchange etc etc They can head it off before it reaches market .
Im sure they start to know while your are righting out your trade to do with buys sell . Who they going look after ?
The little guy or the big guy .
Its a heart felt topic the use of stops or not an we change our mind all the time in rules an stuff we have . Instinct can be good the longer we observe the machinations .
Two different exchanges makes it all the more complex or interesting as well meeting price mid point trades now is a thing also .Like how many fractions of a cent do they want squeeze out of the retailer ?