The guy on the radio that you put blind faith in is, SURPRISE, a bad guy! You make it to the top of the jail w/ zombies and what not showing up whenever they feel like it. Then, you have a bunch of spec ops guys shooting at you, and even when you head shot them, 75% of the time their body armor drastically reduces the damage they take. One problem, THEY'RE NOT WEARING A HELMET. Also, as from earlier in the game, if the enemies head is kind of sticking out from around the corner, the bullets hit an invisible barrier, because the game recognizes that invisible space as part of the barrier they are hiding behind. I lost track of how many guys I ear holed, but the game recognized it as a barrier hit. And during all this craziness on the roof, you've got someone shooting at you from the helicopter pad. I lobbed grenades, I shot some of the best shots I ever had, but the fucker would not go down. Then you find out why. The game can't fucking continue if he dies, 'cause he has to take an injection and become some combination of all the fucking zombies. And before he does that, the game cuts to a cut scene where he magically has you at gun point, with zero explanation HOW that happened.