Right next to the fire, there is a spot where you might practice this.
Lara uses broadhead arrows automatically, after you aim at wooden surfaces.
Shoot two arrows, one after another, but not directly next to each other.
Safe zone around each arrow is marked by the white circle that appears while you are aiming.
Otherwise, both of the arrows will get driven into the surface too close to each other.
As soon as you manage to fix both arrows, jump up over them and zip down.
If you have enough money on you, take a look at the items he has on sale.
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