Quote Originally Posted by Colorado Revised Statutes
TITLE 18. CRIMINAL CODE
ARTICLE 1.PROVISIONS APPLICABLE TO OFFENSES GENERALLY
PART 7. JUSTIFICATION AND EXEMPTIONS FROM CRIMINAL RESPONSIBILITY
C.R.S. 18-1-704.5 (2012)
18-1-704.5. Use of deadly physical force against an intruder



(1) The general assembly hereby recognizes that the citizens of Colorado have a right to expect absolute safety within their own homes.

(2) Notwithstanding the provisions of section 18-1-704, any occupant of a dwelling is justified in using any degree of physical force, including deadly physical force, against another person when that other person has made an unlawful entry into the dwelling, and when the occupant has a reasonable belief that such other person has committed a crime in the dwelling in addition to the uninvited entry, or is committing or intends to commit a crime against a person or property in addition to the uninvited entry, and when the occupant reasonably believes that such other person might use any physical force, no matter how slight, against any occupant.

(3) Any occupant of a dwelling using physical force, including deadly physical force, in accordance with the provisions of subsection (2) of this section shall be immune from criminal prosecution for the use of such force.

(4) Any occupant of a dwelling using physical force, including deadly physical force, in accordance with the provisions of subsection (2) of this section shall be immune from any civil liability for injuries or death resulting from the use of such force.
Had they in ANY WAY posed a threat, he would have been justified (legally) in using whatever force was necessary. If they had not immediately complied any move they made towards him could be easily interpreted as a threat.