The lag was actual and thus a short window of opportunity for the trader. Which makes this very strange, I think. Could the supply strength in their order book temporarily differ substantially from the supply strength in the over all market, causing the delayed reaction? This was around news...
If one thinks of price manipulation, this would be the wrong way so to speak, and also we're talking about holding some 20 pips or so for 20-30 seconds.
Oh well, if anyone has a clue, give us a few lines. Just interested in how these things work. Any market makers out there keen to tell us?
/jaykay