I read it to say that you would just abort one of the F4F and you would eliminate nothing.
To be forced to abort 2 F4F (5 strength each) the Zeros would need to have caused 10-14 damage. At 15-19 damage, 3 F4F's would be forced to abort, and so forth...
In this case, you would abort 5 points of F4F (just 1) and ignore the other 2 points.
As far as eliminating, 4 is less than 5, so there would be no losses to the F4F's. Same method as above.
Rulse 7.31, second paragraph explains this, as I read it.
If I understand your question correctly.