The tonic immobility of the shark when turned upside down is very cool and also to learn that the repellent really makes the shark want to get away from it. The tonic immobility of the shark reminds me of when an opossum plays dead. Freezing like that has value for animals unless they are in a dangerous situation such as "a deer in headlights."
It makes sense that situations which requires the ability to clearly process information in the moment that arousal has to be lower for a successful outcome. The example from the power point where the graph shows the correlation between anxiety and free throws shows how arousal can lead to unsuccessful attempts. In situations where the player needs to make the throw, calmer players have higher success rates than stressed players who "crack under pressure".