Sorry Stark, but withdrawl is a final descision, which should really be changed about this game. There should be a way to cancel anything that you may accidentally click, such as the tactical withdraw button. Once you click that, someone is going to be lost.
Well, nvm about that. I found a way around, but it required me to give up, and restart the game. The checkpoint should be moved back a little to avoid that. Otherwise, 5/5.
I'm not sure if I'm just not trying ALL of the options, but it seems like there is no way to avoid death if you barricade and lock the mall door, then negotiate with the survivors. If you refuse to repair the generator, Ox kills you. If you turn on the generator, the infected break through the entrance, and kill you. There's no way around it!