intersect . . . invisible images

[Richmond Mathewson]

Oh dear, oh dear, oh dear . . .

There I am fooling around setting up an "exam" for my "kiddiewinks"
when I discovered something quite unsuspected about intersect ;

So I have some code that goes something like this:

if intersect(img"A",img"B",4) then
    add 1 to SCORE
    set the vis of img "B" to false
end if

now I am making img "B"invisible to that the gameplayer doesn't
rack up points be performing a repeated intersect

BUT

the intersect CONTINUES registering with a hidden image

this is a "bally nuisance, old bean"

Richmond.