After reading this whole thread I’m surprised nobody has even mentioned the deers tail, or their ear movement …. An alert deer has its tail up, and quite often starts flicking its ears in different directions. Shooting at an alert deer, even at close range is not something I would recommend, and never do myself anymore. but if you insist on taking the shot, ya gotta shoot low. The X marks the spot example is where I always focus anyway….
Watch their tail and wait a minute. Once that tail drops they rarely jump until they have taken the arrow in their side. Kirk