Halo 5 kind of went down the Call of Duty path when it used the left trigger to zoom in but I thought a zoom in function was kind of silly with short range weapons. But I think it could be used kind of like how Doom did it where depending on the weapon, it would either Zoom in or use an alternative mode of fire. Here's some examples:
-The left trigger would charge the EMP on the plasma pistol
-It would lock on with the rocket launcher
-It would use the scope on the sniper rifle.
Some other ideas:
-It could activate a laser designator on the pistol
-It could chamber a second round in the shotgun breach by pumping it for a "double tap".
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-The left trigger would charge the EMP on the plasma pistol
-It would lock on with the rocket launcher
-It would use the scope on the sniper rifle.
Some other ideas:
-It could activate a laser designator on the pistol
-It could chamber a second round in the shotgun breach by pumping it for a "double tap".
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