All they have to do is break in. Armed or not, doesn't matter.
B. A person is presumed to have held a reasonable fear of imminent peril of death or great bodily harm to himself or herself or another when using defensive force that is intended or likely to cause death or great bodily harm to another if:
1. The person against whom the defensive force was used was in the process of unlawfully and forcefully entering, or had unlawfully and forcibly entered, a dwelling, residence, or occupied vehicle, or if that person had removed or was attempting to remove another against the will of that person from the dwelling, residence, or occupied vehicle
E. A person who unlawfully and by force enters or attempts to enter the dwelling, residence, or occupied vehicle of another person is presumed to be doing so with the intent to commit an unlawful act involving force or violence.
F. A person who uses force, as permitted pursuant to the provisions of subsections B and D of this section, is justified in using such force and is immune from criminal prosecution and civil action for the use of such force. As used in this subsection, the term “criminal prosecution” includes charging or prosecuting the defendant.
B. A person is presumed to have held a reasonable fear of imminent peril of death or great bodily harm to himself or herself or another when using defensive force that is intended or likely to cause death or great bodily harm to another if:
1. The person against whom the defensive force was used was in the process of unlawfully and forcefully entering, or had unlawfully and forcibly entered, a dwelling, residence, or occupied vehicle, or if that person had removed or was attempting to remove another against the will of that person from the dwelling, residence, or occupied vehicle
E. A person who unlawfully and by force enters or attempts to enter the dwelling, residence, or occupied vehicle of another person is presumed to be doing so with the intent to commit an unlawful act involving force or violence.
F. A person who uses force, as permitted pursuant to the provisions of subsections B and D of this section, is justified in using such force and is immune from criminal prosecution and civil action for the use of such force. As used in this subsection, the term “criminal prosecution” includes charging or prosecuting the defendant.