Whether the deer is alert to my presence or not has nothing to do with me nottaking that shot again. There are other variables that are more important to me for not taking that shot.
1) A spine shot is not pretty, it requires a follow up shot. Doesn't seem humane.
2) One lung shots can be iffy and sometimes require extensive trailing. There's a good chance that the deer wont be recovered. Again not very humane to me.
PS. If that was a trick question....... good try.