Not quite scientific, but the last dip went a lot lower on both Bitstamp and Gdax than ScamFinex. This indicates they're trying to raise the price on the fake exchange (ScamFinex) to dump on the two real exchanges (Gdax and Bitstamp). If the price went lower on ScamFinex instead, it would indicate they're trying to shakeout longs for a move upwards, but that didn't happen.
This has been my theory about why ScamFinex exists at all - just a fake exchange they can try to manipulate price with to influence price on real exchanges, kind of like the only reason the Comex exists for metals. Both Comex and Bitfinex have absolutely nothing to do with the real metals or bitcoin market, but they set the price through fraud.