A fuse does not make the machine slow. It prevents dangerous flow from continuing when unsafe conditions appear.
LERA works in a similar way: for high-consequence execution, it applies Default-Block (“default blocking”). Actions that are rule-covered, properly authorized, lower-risk, reversible, and responsibility-anchored may move through a faster path.
But when an action violates rules, lacks proper authority, has unclear responsibility, carries excessive risk, or produces irreversible consequences, the system should not permit execution. Execution must stop or escalate for stronger review.
The fuse analogy describes a control position: unsafe flow is interrupted before it becomes damage.