Yup that “Grasping hand” is a little bugger ! (and highly prized by the ‘counterparty brokers’ no doubt )
I did say ‘in Theory’ a number of times and I have no axe to grind with someone who trades through ‘Dukascopy’ - in fact it can get worse than that - I used to spreadbet the DOW (futures) and the typical spread was 14 pips. but in active times, that 14 could get ‘ahead of price’ entirely by another 10 or so !
Here’s another distortion which may not be common knowledge, but perhaps should be !