If forward slip is side-slip then let me attempt to answer ur Q.
Assuming winds from the left on approach' the nose is cocked to the left to track in.
At flare you give right rudder to straighten. The rudder produces force to the left on the tail.
This force besides acting about the vertical (normal) axis also gives translational force to the left. this translational move counteracts the wind from the left momentarily.
However the swing of the left wing may increase the lift on it & raise the left wing. And also if the float has been long the aircraft will start to drift to the right, so again you will require to dip your left wing
In the end you have applied right rudder & left dip.
hope have been of some help