Pilot Increased Engine Power, But The Airplane Continued Drifting Left

The flight instructor stated that he and his student made a straight-in landing approach to runway 8 with a 6-7 knot crosswind from the south because they preferred to land the tailwheel-equipped airplane on the grass runway instead of the available hard-surface runway 16. The student intended to make a full-stall landing with the wing flaps extended 20°. The student pilot crabbed the airplane into the right crosswind during final approach, and before the landing flare transitioned into a sideslip with the right wing down and left rudder to keep the airplane aligned with the runway direction. The flight instructor stated that upon touchdown there was a wind gust, which caus