Forking is standard practice in the military. It's tradition. If it moves, it must be forked. Only peasants swing left and right, true warriors always fork in the classical sense of the word. The overhead is just there to throw forked matter over your shoulder. It's a classic deforking move. Taleworlds may have misunderstood this movement. Fork and defork, page 1 of the field combat manual, issue #457. This manual has only 1 page, but it's all you need as a soldier.