Sounds to me like the buck was not reacting to troponin at all. Some other stimulus; troponin just happened to be where he was.
If a deer's head is down and his tail wags, it's sort of an "All's okay." sign. If the deer has been flagging, and the tail drops but wags, that's a sign that the alarm is over.
If the deer's head is up and the tail wags, it's quite possible that the next thing is a raising of the tail to the flag position as the deer practices being elsewhere.
It seems common for there to be a tail wag before moving, whether or not there is any alarm.
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