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They could have stayed away. But it's more likely that there were just a lot of deaths, and they overlapped.
Who is the mechanic? Arandor was Travis, the picture hints at it, and the city no longer has any units with mechanical parts; they were all killed.
Cassie is not just a city; he is a savior. Otherwise, everything is correct.
Now, I'm thinking, wouldn't it be better to execute Mechanic Prowler, the killer of the Dragonling who can kill two units, than Scavenger, the Mold?
Why do you say Ment is from a different team? He could have been mining earlier.