God Bless ColoradoDoctrine of retreat is from common law. There is no statutory provision regarding the duty of a person to retreat before countering the use of force with force. The doctrine derives from the common law. People v. Watson, 671 P.2d 973 (Colo. App. 1983).
The common-law doctrine of retreat to the wall has been modified and is applicable in this jurisdiction only to cases where the defendant voluntarily enters into a fight, or the parties engage in mutual combat, or the defendant, being the assailant, does not endeavor in good faith to decline any further struggle before firing the fatal shot, and possibly to other similar cases. Harris v. People, 32 Colo. 211, 75 P. 427 (1904); Enyart v. People, 67 Colo. 434, 180 P. 722 (1919).
The defendant, if he did not provoke the assault, is not obliged to retreat or flee to save his life, but may stand his ground, and even, in some circumstances, pursue his assailant until the latter has been disarmed or disabled from carrying into effect his unlawful purpose, and this right of the defendant goes even to the extent, if necessary, of taking human life. Boykin v. People, 22 Colo. 496, 45 P. 419 (1896); Enyart v. People, 67 Colo. 434, 180 P. 722 (1919).