I wonder if there have been Florida juries who checked more than one of the first three lines.
I remarked on the main site that the connection between not guilty and the choice of excusable and justifiable homicide doesn't seem to be precisely stated. Also on page 10 of the jury instructions there is, "George Zimmerman cannot be guilty of manslaughter by committing a merely negligent act
or if the killing was either justifiable or excusable homicide". So I guess George might be not guilty but merely negligent.
Now that could be a compromise verdict.