Simplicity
You stance your feet correctly and raise your fists, the other two men notice your change of movement and do the same. However there isn't a certain glint in their eye that shows you they Are out for blood. You take a right hook at one and he steps back a bit, but enough for you to get his shoulder. When he stepped back, the other inmate rushed forward with a gut-punch that caught you off guard. So it seems, they work together to defeat you. They have strength in numbers but maybe they can be outmaneuvered. Look to your surroundings...