Twist

Twist the selected objects. If the object is in point editing mode then the tool will have effect on the selected points only.

Define the center of twisting by clicking in a View window. The twist axis travels trough that point, orthogonally to the input plane. Click second time to define the length of the twist axis. The shorter the axis, the faster objects will twist. Move the mouse around the twist axis and click third time to finish the modification.