A1: Ez just keep shooting it untill it goes down

A2: When you get out of the room where you have to fight the dogs break the door but instead of turning left to fight the helicopter turn right get up on the ledge there is a rocket launcher with 3 ammo if you hit it 3 times it will die then you fight the girl find a shotgun climb up the ladder go to the door and shoot her til she gets up again don't let her get on the gun 20 shots later you win