Finn's loss of credibility can best be attributed to "not matching his level of dynamism to the demands of the situation".
It goes past the words we say. The capacity to hear the words another person is stating is just a single little piece of dynamic correspondence that includes the capacity to peruse outward appearances, motions, manner of speaking, and body pose in the meantime as tuning in to what the individual needs to state. In case the speaker fails to deliver these dynamics, the listener will tune out as happened in the given case.