The two types of activity
Every transaction in the market is either initiative or responsive. Understanding which type is dominant in any given moment is one of the most useful real-time reads you can develop.
Initiative activity
Initiative buyers and sellers are creating price movement. They are not satisfied with current prices and are aggressively seeking value elsewhere. They trade using market orders — consuming resting liquidity, driving price in their direction.
Initiative buying: aggressive buying above the value area, above previous highs, into acceptance of higher prices. Initiative selling: aggressive selling below value, below previous lows.
When initiative activity is present and sustained, you're watching price discovery. The market is seeking a new fair value. Don't fight it — trade with it or step aside.
Responsive activity
Responsive buyers and sellers are reacting to perceived mispricing. They believe price has moved too far from value and are fading the move, providing the liquidity that stops trend days from trending forever.
Responsive buying occurs below the value area — participants perceive the price as cheap and step in. Responsive selling occurs above the value area — participants perceive the price as too expensive and sell.
In a balanced market, responsive activity dominates. In a strongly imbalanced market, responsive traders get run over.
If price is testing a key level (VAH, previous day high, POC) and you see strong responsive activity — large bid orders absorbing aggressive selling, delta turning positive while price holds — that's evidence the level is being defended. If you see initiative selling chewing through the defense, that's a different story.
Applying this in real time
The footprint and DOM help identify which type of activity is present. High negative delta at a support level without price falling through it = responsive buying. Large offer being hit repeatedly with price still declining = initiative selling dominating over responsive buyers.
Most of the ambiguity in trading comes from not knowing which type of activity is present. Developing this read — through screen time, footprint analysis, and DOM observation — is one of the highest-leverage things you can do.