You made the right choice by backing out. Daylight will tell what happened. As for a guess she must be alert and looking at you and they can spin faster than the arrow gets there.
Most usually have a phone already, if you are still holding on to an older phone than sure. A decent camcorder can be bought for a $$$$ or $$$
https://www.popularmechanics.com/technology/gadgets/g40166657/best-camcorders/
If you send me the locations, I will tag one or 2 by the end of the yr and get you an accurate deer age
j/k
#1 & #2 = 3yr
#3 = 4yr
#4 = over 5 or 6yrs
#5 =2yr
There was a big debate on some grim reaper mechanicals design that didnt open because of tight springs . This was on archery talk. So much so that GReaper ended up sending new spring and cups to anyone who called them.
My suggestion would be shoot one in a foam target to make sure it opens for you.