Is that a hole in the ceiling directly in front of you?
The yard leaf could extend all the way from ground to sky. If the leaf you are in can see the upper part of this yard leaf, it has to draw the whole of it.
A hint brush in the right place would force this big yard leaf to be split into two pieces. A top half which you can see, and a bottom half which you cannot, and therefore does not get drawn.
I might be totally off track as I can't really see what's going on, but it seems like a horizontal hint level with the top of the whole will do the trick.
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