With GBP it's clear was happened! It was a fake game among the banks, in the same second with large volume beaten. They determine TP-level in advance. Only so then can earn millions in a short time. First they go short and then several hundred pips long. After ferris game they get off quickly and leave the market to the ordinary traders till to the next time they reunite again.
Anyone experience mass slippage? If you don't mind sharing by how much? Mine was bad lets just put it that way. I've got a formal request with broker to audit because my trading partner both same entry same stop and it was trigger accurately. Mine not so much. Just wondering trying to compare notes or brokers that's all. Dealing with it at the moment.
Let's just say I'm not to far up from your friend myself. My partner stop side by side trading with him triggered -60 pips, mine lets just say multiple that by 18 times :-( . Broker looking into it ATM, good luck to your friend. Hope he can recover timely.