Deer can be strange and peculiar creatures. In the video below, a herd of deer queue up in a line to jump over a fence one at a time. The entire herd had almost finished crossing when something inside the forest seemed to spook them. In a rush, the herd says goodbye to timidity and leaps back to safety.
We’re not going to hazard a guess as to what was in the forest, but the Wolperdinger comes to mind.