This is an alternative deformation brush for the Pose Brush intended quickly change the proportions of the mesh. The regular mode scales using the segment's origin as a pivot. The inverted mode drags the entire segment using the grab delta. The only difference with the regular pose brush is that it is not compatible with IK, so the option is disabled and set to 1 segment. The rest of the options should work as expected. Reviewed By: sergey Differential Revision: https://developer.blender.org/D7374