I have the mod on and the icon is on my hud but it never triggers, even after aiming down sights for a while.
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Anti barrier doesn’t activate like that. It’s just always active on sidearms, and can be used whenever.
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The barrier has a white bar, and you have to do enough damage in a very short time, to actually break the barrier, and prevent the champion from full regeneration. I hope that helps.
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The marked comment is correct