Legion surrounding the heroes, Stealth’s extra masks

At least three hundred of them stood halfway down the street, near the crater. They stretched across La Brea Avenue, blocking it, at least four or five rows deep. Their arms were crossed. Their jaws didn’t move. He glanced over his shoulder and saw a similar line behind them, and one in either direction on 3rd Street.
They were surrounded.
“I have no ammunition,” said Stealth. “I assume the captain is incapacitated. Is Zzzap well enough to fight?”
“Maybe,” said St. George. He did a double take and stared at her face. The hole in her mask had vanished.
“Focus, George,” she said.
“How did you—”
“I carry a spare mask in my belt.” She tipped her head to the line ahead of them. “Be ready.”

Excerpt From Ex-Communication, pg 578-579
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546