History of Tunnel Vision

Overview

Tunnel Vision is a weapon perk: reloading after defeating a target greatly increases target acquisition and aim-down-sight speed for a short time. The Destiny Game Wiki lists it as a Season 14 trait (about 5 seconds, plus aim assist and accuracy).

Trespasser

It is the Trespasser Catalyst perk of the Trespasser sidearm, earned in No Trespassing.