quail his dog had located, but before the doctor could do so a single bird flew out. It did not fly where Dr. Hooper expected but instead headed roughly parallel to the woods, past Montague and Mougin, straight toward appellant. Hooper caught a glimpse of the quail out of the corner of his eye, quickly pivoted to his left and without hesitation shot in the direction of his companions, even though he professed a prior knowledge to their being within his general line of fire. Pellets from this shell hit both men in the face causing some minor discomfort to Montague but seriously injuring Mougin.
With these facts, we now analyze the pertinent law in terms of appellant’s claims of error, all of which are related to the trial court’s instructions concerning contributory negligence and assumption of risk. The distinction between these two tort concepts is slight, often difficult to pinpoint and usually of little practical significance; however, this Court has recognized that some legal difference exists. To be contributorily negligent, a plaintiff must either perform or fail to perform an act which is a proximate cause of the particular injury of which he complains. His conduct is judged by a norm of ordinary care and the failure by a plaintiff to meet this standard constitutes contributory negligence barring his recovery. Christ v. Wempe, 219 Md. 627, 150 A. 2d 918 (1959); Potts v. Armour & Co., 183 Md. 483, 490, 39 A. 2d 552 (1944); Warner v. Markoe, 171 Md. 351, 189 A. 260 (1937). On the other hand, a plaintiff is said to have assumed the risk of injury when, with full knowledge and understanding of an obvious danger, he voluntarily abandons his right to complain by exposing himself to that particular risk. Kasten Constr. Co. v. Evans, 260 Md. 536, 544, 273 A. 2d 90 (1971); Gibson v. Beaver, 245 Md. 418, 421, 226 A. 2d 273 (1967); Bull Steamship Lines v. Fisher, 196 Md. 519, 525-26, 77 A. 2d 142 (1950).
The existence of contributory negligence, as with assumption of risk, ordinarily is a jury question and both are affirmative defenses with the burden of proof placed