the interpretation of this visualization is this: near daily low a big rough market and a big sell market order of the same quantity appeared. it was immediately identified by an algorithm which started selling using sell markets in a "clever" manner.
at the same time, sell markets were supported with huge sell limit (on the depth of market as the white line). when no one wanted to buy this big amount and fill the huge sell limit, the subject starts selling in a harsh manner - using big sell market orders. the price drops a little bit down and the subject closes the position in a "clever" way using smart activity. taking profit.
the price made a small pullback up and the algorithm started selling again, using a high amount of sell market orders in a matter of (mili)seconds. at the same time, big sell limit appeared at the depth of market, was filled this time with a big buy market order and the price slides lower. the selling subject closed the position in a smart way, taking profit again.
again, it started opening bigger sell markets now to break the daily low. its big sell limits were strong enough to eat all the offered liquidity in the dept of market.
at the break of the daily low a 100-contracts big buy market order tried to protect the zone, but was neutralized with a 100-contracts sell limit. moreover, the 100 sell limit was supported with an even bigger sell limit (the size cca 230) accompanied with sell market in the size 120! it hit the daily low, closing the position in a clever way, taking its profit (yes again!) and reversing the position for long.
this is how a very powerful and very clever scalping algorithms operate..
this is where it happened in the chart (daily low - sensitive area)
this is how the footprint charts of the area looks like