In The Great Wall, William & Tovar are facing and battling the beasts in this scene,
when Tovar throws his axe in the air, then William shoots his arrows on it.
Why is he shooting arrows on axe?
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William and Tovar are battle buddies. They mount an attack together by diversion and attack which is seen multiple times in this film.
First when they are on the wall as prisoner, Tovar uses a flag to invite Taotei to attack him and slides out of way, taking this opportunity William kills it.
Now due to fog hindering visibility Taotei are drawn towards sound. So they take positions to direct Taoties to sound of arrow hitting axe.
They do it by Tovar tossing the axe, William striking it and then Tovar can hit it in the eye for a kill.