PTS Week 4: when switching weapons the Predatory healing proc is cancelled or lost. So if you make a kill then immediately switch to another weapon then you don't receive any healing from the Predatory talent. I don't know whether this is working as intended but I don't think this should happen. I've made the kill, Predatory now owes me the benefit of the talent irrespective of what other weapon I choose to use next and how long before I use it and whether I switch immediately to have it ready.