Cows also tend to be very curious. If you walk into a pasture and start doing something weird then most of the cows will usually run over to see what you’re doing.
It could have just been a person running through the woods and the cows were running after them to see where they were going.
I once quit one of my antidepressants (venlafaxine) cold turkey and got to feel my brain throb nonstop for a month straight.