Final answer:
The text provided does not contain information on Pi's actions when a shark swims close to the raft. It appears to include mixed narrative elements, preventing an accurate description of the event without additional context.
Step-by-step explanation:
The question pertains to an event from a narrative where the protagonist, referred to here as Pi, encounters a shark while on a raft. However, the provided text does not explicitly detail the actions that Pi takes when a four-foot shark swims close to the raft. Instead, the concatenated text appears to be from unrelated scenarios which might be part of an elaborate fictional story or a creative writing piece. One segment describes a suspenseful moment with sharks and a disco ball, while the other appears to be a separate scene involving characters signaling to each other with a makeshift flag.Given the apparent mix-up in the narrative elements, it is not possible to determine Pi's reaction to the shark encounter from the text provided. If this question refers to a specific book or a movie that contains this scene, such as Life of Pi, additional context would be needed to give an accurate description of Pi's actions.