Stealth assessing numbers quickly

The cloaked woman stared at him. Danielle recognized the look and could guess what was coming next.
“We are at a sub-base on the Yuma Proving Grounds, correct?
The city of Yuma is fifty-nine miles south-southwest of our current position.”
Freedom paused just for a moment. The corners of his mouth twitched with grudging respect. “That’s correct, ma’am.”
“So the area you ‘cleared out’ with your superior numbers and weaponry consists of the mostly empty proving ground and the outskirts of a small city, population ninety thousand, less than fifty thousand of which would have transitioned according to all known statistics regarding the ex-virus.”
The smile flattened out. “Correct again. Ma’am.”
“There are over five million ex-humans within the city limits of Los Angeles,” said Stealth. “This is one hundred times the numbers you have dealt with, and does not include the greater Los Angeles County area. If we had killed one hundred exes a day, every day, for the past nineteen months, we would have only eliminated one percent of the undead population of the city.” She paused to let the numbers sink in. “We have better uses for our time and resources.”
“I apologize, ma’am.”
“Why did you say most of them?”
Freedom blinked. “Ma’am?”
“When you were explaining the Army’s aggressive stance, you said you burned most of the ones you had contained. What did you do with the ones you did not burn?”

Excerpt From Ex-Patriots, pg 266-267
Peter Clines
https://books.apple.com/us/book/ex-patriots/id585738393