I don't know the laws in your state, particularly, but I'd be very surprised if there was a law that did not allow for defense of others.
Every law pertaining to the use of force of which I am aware makes exceptions and qualifiers for defense of others.
Even in states where retreat is required there are exceptions which require "complete safety of self and others", or something of that nature.
You should be able to find the exact text of the laws by "googling" something like "law of physical force mississippi" or "mississippi penal code" and then search through the codes for "physical force".
"Good Samaritan" laws pertain to an instance of hurting the person that you are trying to help, so are not really applicable as to the legality of actually attempting that assistance.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.