Sara Connor is trying to escape the mental hospital when she was ambushed by the guards and security. You are protecting John Connor. You aren't the T-800. But a T-850 T-1000 hybrid. You are similar to the T-X but instead of an Endoskeleton under liquid metal, you are able to form weaponry like bullets and bombs. And just like the Rev-9, you can split apart from your very advanced endoskeleton. Unlike none at all, you can rebuild your liquid metal husk by absorbing any type of metal in the environment

Sara Connor: "No! He'll kill us all!"

Guard: "Hurry up! Inject her!"

Security Guard: "Hold Sara Down!"

You and John Connor get closer

John Connor: "Help Her!"

You: "Wait here."

You go to save Sara Connor