I think I missed that part of the story, my bad (I went through a lot of games yesterday). I think why it bothered me so much is because from a gameplay perspective I couldn't see the point of being there as it just felt like a random roadblock. Perhaps just a counter of how many enemies you have to kill to get back to the turrets would have helped me. That being said, this is really subjective as Im not a big fan these kind of random mechanics, so don't take it too harshly please, I still enjoyed playing :)