If you don't know how far the straight leg is going, and you are impatient to draw water with the straight leg. Then you can try to relax some stretched legs, but pay attention to whether the swing on the straight leg is behind the kick on the bent leg. If not, try to do it. Find the right way to exert force between stretching and bending, which can be straight or curved.
It's important to set straight legs. This is easy to judge.