Balanced and unbalanced

Balance diagram

So there is me standing up then two girls that have the same strength star fighting over me one is pulling me to the right and the other girl to the left. So normal force and gravity force are the same and applied force are the same because they both have the same strength the applied force is the same size in each side 

Unbalanced diagram 

So i am walking when all of the sudden areally  big branch falls on me. There is  applied forces pushing me down and gravety forcespushing me down as well a  making this sitution really unbalance