Triple Shot
Triple Shot is a Skill from the third tier of the Hunter Upgrades in Rise of the Tomb Raider. It enables Lara to simultaneously fire three Arrows at separate targets that have previously been locked while zoomed in with a fully drawn bow. It is effectively an upgrade to the Double Shot skill, which she has to learn first in order to unlock the Triple Shot.
The Triple Shot skill is somewhat useful for smaller and medium sized groups of enemies as it enables Lara to stealthily get rid of more than one at a time.
To unlock the Triple Shot, Lara first needs to upgrade at least 19 other skills and the Double Shot to unlock the third tier of Hunter Upgrades.
This is an update specific to the Bow; it does not work with any other weapon.
Usage
Once the Triple Shot skill has been unlocked use it like you have used the Double Shot before: hold aim and fully draw your bow as you usually would. Then aim and zoom in (Consoles: click R3, PC: Z). Now hold the fire button to charge the bow. If targeted correctly the targeting reticle will turn into a red diamond. This indicates that the first target is now locked. Now, while still holding down the fire button, target a second and third nearby enemy and finally release the fire button. Lara shoots at all three targets simultaneously, hopefully killing all of them.