Never, ever, ever let a mathematician on your jury. Drilled into my head by a now-deceased colleague "between spoons of soup" over our several years of collaboration.One of the jurors is a retired math teacher. The jury also has a lawyer, a banker, and some others that could have been rejected.
Why? -- Because no case has everything fitting together like the proverbial Swiss watch or jigsaw puzzle. There is always a loose end, and mathematicians (and, to a lesser degree, engineers and other scientists) both abhor loose ends, and reject anything which contains one.
The latest jury question does not sound like it came from a math teacher. It doesn't sound like the juror is near a conviction either.