I would say the brow tines of a buck. He pushes his forehead into the tree, makes the punctures with the brow's then moves his head and neck up or down then repeat all over again. Have seen them do this many times. And have seen a lot of pine trees and hemlocks tore up by bucks.
When a bear marks it's territory, it will reach up as high as it can to show how big he is. When another bear finds the mark, if he is bigger he will mark higher than the first bear as a sort of challenge. Or if he does not measure up, he may mark as well but will move along and not stay in the area.