He is moving
in for the kill. His offensive
sword is raised for the attack.
But equally
important is his shield. This piece of defensive equipment equipment is
there to protect HIM. It allows him to carry out his offensive actions. He
would never enter a battle, or a war, without that defensive shield.
Yes it is defence,
but it is NOT defending civilians. It is defending the warrior. It is
defending his ability to wield that sword.
Without the
shield he would be dead and thus unable to kill.