18-1-707. Use of physical force in making an arrest or in preventing an escape.
(7) A private person acting on his own account is justified in using reasonable and appropriate physical force upon another person when and to the extent that he reasonably believes it necessary to effect an arrest, or to prevent the escape from custody of an arrested person who has committed an offense in his presence; but he is justified in using deadly physical force for the purpose only when he reasonably believes it necessary to defend himself or a third person from what he reasonably believes to be the use or imminent use of deadly physical force.
In addition, the person on whom physical force is used under subsection (7) must have either committed a crime in the presence of or attempted escape from custody in the presence of the person using the physical force. People v. Joyce, 68 P.3d 521 (Colo. App. 2002).
So far, it appears as if most all of the citations I've given would apply in a similar case in Colorado.