An indicator that blocks the literal sense rules out the original assigned sense in the context; an indicator that specifies the intended meaning guides interpretation toward a particular alternative. The same context may perform both tasks, but they are conceptually distinct.
In “the brave lion gave a speech,” speaking points toward a human agent. Courage is the semantic relation between lion and person; speaking supplies the contextual reason for not understanding the animal.
Keeping the two functions distinct prepares for a more precise account of metaphor and non-resemblance figurative transfer.