Which foam application technique involves directing the foam stream on the ground near the front edge of a burning liquid spill?

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Focusing foam on the ground near the front edge of a burning liquid spill and letting it roll across the surface creates a continuous foam blanket that cools the fuel, blankets the fire, and reduces vapor release. This roll-on approach rapidly covers the spill by using the foam’s flow to blanket the surface, which is especially effective for hydrocarbon fires where you want a stable layer that prevents re-ignition. The other methods differ in how the foam is applied: directing foam onto the flame from above, spraying foam from a height to blanket the area, or forming a foam barrier around the outside edge rather than rolling across the surface. The roll-on technique best matches the described action of laying foam on the ground at the edge so it can spread and cover the spill.