use PAINT MASK to remove something?

I am trying to use the Paint Mask to remove something from another mask like it was an eraser. Is that possible?
In my example file I have got a background. Then I drew a star with a poly mask now I want to remove the RIGHT SIDE of the star with the Paint Mask. I know how to ADD more of the background to the Star Mask but I can not figure out how to REMOVE something with the Paint Mask.
Any suggestion?
Thanks a lot

Attached Files
File Type: zip paintmask.zip (6.2 KB)
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