Guild Wars 2

When I active Virtue of Justice, it applies the 4s burning 1 time. The tooltip says 5 attacks to activate and the boon falls off after 5 attacks. But during those 5 attacks, I get 1 stack of burning. Then I don’t get the passive for 20 or so seconds. Why doesn’t it stack 5 times?

The ability has two parts. A passive effect, where every fifth attack burns the target. And an active, where your next one attack will burn the target, then you lose the passive while it recharges. Activating it only gets one burn, but it’s longer and lets your nearby allies get the same one burn on their attack.