Caster LB gauge should only halve when manually cancelled

[Atreus]

We should not be deciding on buffs or nerfs based on one game mode, because preventing caster buffs just because of slaughter would leave them dry in secure. If anything the game mode should change, or the changes should be specific to that mode.

What he said. Balancing around what's kind of a lackluster, just-for-fun gametype is not a smart idea. If you want to make Adrenaline specifically the way OP describes then whatever, but keep Limit Break in Secure and WD the way it is. That crap needs the interrupt penalty.