Soldier's Focus should be a boon that you'll be able to see on their bar (I am assuming here that this will be the case as it gets expended when a burst is used), so you SHOULD have a tell that indicates that you are fighting a tactics warrior, ergo, stop using the abilities that will let them one shot you. Unlike Scrapper, Weavers can do that. You do not have to use a dual attack, you do not have to take the dodge trait that gives barrier. You are not in the situation where just by auto attacking you get barrier. Did you even read what I wrote? Where does it say the 50% buff is only up when soldier’s focus is up?