Hull Health Thresholds

An ability gated on hull health ("while your hull is below 60%") checks the hull when the ability fires, and an ability that fires at the start of a round keeps its effect for that whole round.

Some abilities only work while a ship’s hull is above or below a share of its starting hull. The check happens when the ability fires, not on every shot. An ability that fires at the start of each round looks at the hull as the round begins; if the hull is past the threshold then, the effect holds for the whole round, even if the hull crosses back during it, and if it is not, the effect waits for the next round to check again.

So the round in which the hull first drops past the line still fights without the bonus. Chang’s captain maneuver, +10% damage while your hull is below 60%, first appears in a battle log in the round after the hull fell below 60%, and every round after that while it stays there.

See also: Chang