So the last scene tells us that boats are not that safe and now here comes the scene where docks aren't all that safe either.
Brody flips through the shark book. There's a quick foreshadowing about the ending in this series of short shots.
The pics of the real wounds shows us the real danger that sharks pose on humans. Placed in this movie, it plants the seed in our heads that yes all this can happen. (Whether it can or not, the seed is planted.)
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