Ive often seen freinds who think particular deer are not on alert, be completely wrong about the deers state. Just because they arent stomping, ears forward staring, or darting around, does not mean they haven't figured out danger looms nearby. Its the very subtle body language and reactions with other deer and nature that tells the tale. I think there are many who think they know what deer act like when completely relaxed, and may never have truely even seen that because the deer have always known something was up.
To date, on truely relaxed deer that ive shot, not a single deer has even attempted to jump string regardless of sex. On the flip side, every last deer Ive shot at that was not truely relaxed and indeed knew something was up, did jump. Doe reactions tend to be more quick then bucks, but bucks do jump when not relaxed. Anymore, I about will not even shoot if I get a single indication that deer caught something about my presence, no matter if it appears to have "calmed down". They still flinch and drop. Shoot at feeding doe with heads down actively engauged in feeding, and jumping wont happen.