I'm with Erno and Vapa. I've had them return in less than an hour when spooked. Many Deer when spooked backtrail themselves often, especially if they are just breaking cover when spooked. But half the time return.

If you draw blood and the other Deer smell the blood and your scent together, they may associate the two. I usually give that spot a rest. Been my experience there are dumb Deer and smart Deer. The smart ones are usually survivors. The dumb ones die young.

The stupidest Deer I ever saw had it in his mind to take a short cut through my Jeep Cherokee. I had both front doors open, it looked left, then right then started straight for the open door. My dog was in the back seat asleep, he woke up and dissuaded that Deer.

I was stiill hunting and caught a Deer laying down asleep. My first arrow hit eight inches short, the Deer looked at the arrow then at me and the next arrow was right through the chest. Point is, Deer are notional and sometimes there is no telling what they are going to do.

IMO most Deer under two years old only survive because of their keen senses and speed, it is all instinct.