I love the story so far, and I'm very curious to see what happens next. Your stories always have very captivating plots :) I have a minor criticism: even though the story takes place during Mann VS Machine, you still focus exclusively on one Team. On the one hand, this is great for exploiting the expected loyalty and affection between teammates as a source of drama (that is to say, obviously BLU Heavy will be desperate to save BLU Medic, and feel heartbroken and guilt-ridden over his death. If that had been RED Medic, the scene wouldn't have been half as powerful). But on the other hand, it feels like a waste. Here we have a story where the protagonists are being infiltrated by human-looking robots: can you trust the ally watching your back, or is he the enemy who captured your real ally and took his place? In such a suspicion-dripping environment, you could milk so much interesting drama from the pre-existing tension between allies who used to be enemies. Hell, what if the ally is not a robot at all, but is still plotting against you, maybe trying to use the robot army as a way to take you out for good? The guessing games keeps the tension up. Plus, now that both Teams are supposed to be working together against a common enemy, it doesn't make much sense for the enemy to only target one Team. You could say that the enemy is currently focusing on the one Team that is currently stuck within the city's borders, employing a "divide and conquer" strategy. But if the enemy has got so far as to sabotage Respawn, I'd expect "Purple" Miss Pauling at least to express concerns over the possibility that the RED Team might be under attack as well, wherever they are (it's not like Gray Mann, or these Tian Lu people who are likely connected to him, couldn't send some of their robots to Kong King and others to entirely different locations in the world). Again, this is just a minor criticism. The question is not so important that it couldn't simply be handwaved off, and the plot is engaging as it is. I just think there might have been more potential if you had made the group of protagonists a mix of REDs and BLUs.