They probably don't. It is your superior mind bert, that is probably putting the thought in their heads. All they see is this big number and they turn it. Those guys are probably down there scratching their heads saying, "Wow, that was weird!"
how? because you place your stops where 95% of every other trader places his. they know how you think. they are not stupid.
The same reason that they know if someone pulls a fire alarm in a building some people run out right away, some wait to see what others do, some wait for the smoke, some get fried.... individual vs. crowd psychology and the law of averages.
most of those guys are 50x the trader we'll ever be... then again they also have a huge edge over us, plus they've been traders for years prior to becoming specialists anyway, so they know everything we know and think, and then some...