Maybe somebody's already noticed this, I dunno. Marathon Infinity is a decade old, now. But for what it's worth:
"go ahead, you couldn't possibly have killed more than none."
This is a line from the secret Double Aught terminal on Aye Mak Sicur. It's also a reference to Neal Stephenson novel The Diamond Age, or more specifically a story told to Nell by Dinosaur, himself a character in The Young Lady's Illustrated Primer.
The actual quote is as follows:
We drew lotsm and I was chosen to go among the ants for the first round of trials. I followed the Queen into the midst of her army, picking my way slowly until the Queen said, "Step lively, lung-breather! Time is food! Don't worry about those ants beneath your feet—you can't possibly kill more than zero!" So from then on, I just walked normally, though my claws became slick with crushed ants.
Earlier, we lear about the mathematical system of the ants:
In ant arithmetic, there are only two numbersL Zero, which means anything less than a million, and Some.
Yeah, yeah, I reread all the terminals from all three games and this is the best insight I can come up with. Thought it was interesting, though.