YMMV / The XCOM Files

• Annoying Video Game Helper:
  • Occasionally local militias, police or army may start a mission against monsters and you would face a difficult task of keeping them alive while fighting monsters.
  • On most "civilian defense" missions, you'll have a pile of gear at your spawn point, the stuff you didn't equip to your agents. While this isn't a big deal when your spawn point is in your transport, it's a very big problem on things like Council defense missions, where civilians will see the big pile of weaponry and decide to pick up a gun and fight back. More often than not, this will result in them shooting your agents in the back.
• Demonic Spiders: Black Lotus Assassins. Their ranged weapons have a good chance to One-Hit Kill any agent with the armour you have at this point. They are invisible unless you come within 2-5 tiles. They have enough hit points to survive several hits of anything you have. Their high reaction score means a shot in the back will get a reply. Somewhat mitigated by their preference to ambush at random spots rather than patrol the area or approach visible enemies. (Which is actually an engine bug.) Somewhat nerfed by recently added "sniper-spotter" mechanics, allowing a spotter to approach them from the back and the rest of the team to shoot them from a safe distance.