That was the story today. Lead ADTF would show a big wall @ ask 0.036. Behind him was a much smaller size @ 0.036. When buyers went for ADTF, he retreated, as you said. They repeated this maneuver to demoralise the market and limit fills a number of times in the last part of trading day. And FINRA likes to crow about 'protecting the individual investor' and 'ensuring the fairness of the markets.' Bunk.