At the end of the first huge battle, the noble that is on horse that comes up to William starts talking to him. This is after he cuts off the leader of the englishes armies head.And before Willaim starts celebrating with the rest of his fellow scots, the part where he sticks his sword into the ground. Anyways in the backround when William and the noble are talking there is a Scotish and English soldier fighting. The engligh soldier has only a wooden stick for a weapon. The scot hits him and he doesnt fall over. Then they just clash there swords again extremely lightly. Looks like someone made a screwup in the editing department to me.