The only reason Ethan didn't kill them was because he figured these two zombies might still be useful. He could turn them into tool-zombies—basically undead errand boys—to help him search for the stone slabs.
After all, the meteor shower had scattered debris over a huge area. And when it comes to grunt work, more zombies means more manpower… or corpse-power, in this case.
"How many zombies do you have under your command?" Ethan asked.
"My command? Uh… you're looking at 'em," Jerky replied, then immediately looked embarrassed.
"…This is it?" Ethan stared at the lone zombie standing beside Jerky, feeling a bit speechless. So this was it? Just one sad little minion?
Some "Overlord" he was. Talk about underwhelming.
Then again, in a place like Albuquerque, it made sense. Regular zombies had a hard time forming any kind of organized horde.
Ethan deactivated his Domain of the Dead and pulled out the Star Map slab with a flick of his wrist.
"You guys ever seen anything like this?"
