On lethal damage from infected, before dying, live for 6s ignoring defense, immunities, status, CC, ammo usage or fatigue. Tanks are taunted but buff attack bonuses are halved. Each use lowers time by 0.5s, min 3s. Medkit use resets time.
Dying Berserk won't end while perfoming use action.
<Immunity pierce negates attack bonuses>
<No ammo save with custom weapons>