Utah Stand Your Ground Law
76-2-402. Force in defense of person – Forcible felony defined.
(1) As used in this section:
(a) “Forcible felony” means aggravated assault, mayhem, aggravated murder, murder, manslaughter, kidnapping and aggravated kidnapping, rape, forcible sodomy, rape of a child, object rape, object rape of a child, sexual abuse of a child, aggravated sexual abuse of a child, and aggravated sexual assault as defined in Chapter 5, Offenses Against the Individual, and arson, robbery, and burglary as defined in Chapter 6, Offenses Against Property.
(b) “Forcible felony” includes any other felony offense that involves the use of force or violence against an individual that poses a substantial danger of death or serious bodily injury.
(c) “Forcible felony” does not include burglary of a vehicle, as defined in Section 76-6-204, unless the vehicle is occupied at the time unlawful entry is made or attempted.
(2) (a) An individual is justified in threatening or using force against another individual when and to the extent that the individual reasonably believes that force or a threat of force is necessary to defend the individual or another individual against the imminent use of unlawful force.
(b) An individual is justified in using force intended or likely to cause death or serious bodily injury only if the individual reasonably believes that force is necessary to prevent death or serious bodily injury to the individual or another individual as a result of imminent use of unlawful force, or to prevent the commission of a forcible felony.
Around here, it comes down to, can I convince a jury that I “Reasonably” needed to use a certain level of force to stop the attack. I suppose, if you were 86 years old, 5’-4" weighing in at 85# and the person rushing you was 6’-6" 355# you could argue that you needed to respond in a serious manner. But equal equal could certainly make it a tough sell.